diff --git a/bin/mbcheck b/bin/mbcheck
index 6cb1163..f8d5966 100755
--- a/bin/mbcheck
+++ b/bin/mbcheck
@@ -23,29 +23,29 @@ if (argv.help || argv._.length === 0) {
 
 Step(
     function() { mbtiles = new MBTiles(argv._[0], this); },
-    function() { mbtiles.integrity(this); },
+    function() { mbtiles._integrity(this); },
     function(err) {
         if (err) throw err;
-        mbtiles.exists('tiles', function(err, exists) {
+        mbtiles._exists('tiles', function(err, exists) {
             if (!exists) throw new Error('`tiles` table does not exist.');
             this();
         }.bind(this));
     },
     function(err) {
         if (err) throw err;
-        mbtiles.exists('metadata', function(err, exists) {
+        mbtiles._exists('metadata', function(err, exists) {
             if (!exists) throw new Error('`metadata` table does not exist.');
             this();
         }.bind(this));
     },
     function(err) {
         if (err) throw err;
-        mbtiles.metadata('name', this.parallel());
-        mbtiles.metadata('type', this.parallel());
-        mbtiles.metadata('desciption', this.parallel());
-        mbtiles.metadata('version', this.parallel());
-        mbtiles.metadata('format', this.parallel());
-        mbtiles.metadata('bounds', this.parallel());
+        mbtiles._metadata('name', this.parallel());
+        mbtiles._metadata('type', this.parallel());
+        mbtiles._metadata('desciption', this.parallel());
+        mbtiles._metadata('version', this.parallel());
+        mbtiles._metadata('format', this.parallel());
+        mbtiles._metadata('bounds', this.parallel());
     },
     function(err, name, type, description, version, format, bounds) {
         console.warn('Metadata');
@@ -64,7 +64,7 @@ Step(
         Step(
             function() {
                 var group = this.group(),
-                    query = mbtiles.db.prepare(
+                    query = mbtiles._db.prepare(
                         'SELECT zoom_level AS zoom, ' +
                         'COUNT(zoom_level) AS count ' +
                         'FROM tiles ' +
@@ -95,7 +95,7 @@ Step(
         Step(
             function() {
                 var group = this.group(),
-                    query = mbtiles.db.prepare(
+                    query = mbtiles._db.prepare(
                         'SELECT MAX(tile_column) AS maxx, ' +
                         'MIN(tile_column) AS minx, ' +
                         'MAX(tile_row) AS maxy, ' +
@@ -113,7 +113,7 @@ Step(
                 if (err) throw err;
 
                 var group = this.group(),
-                    query = mbtiles.db.prepare(
+                    query = mbtiles._db.prepare(
                         'SELECT zoom_level AS zoom, ' +
                         'COUNT(zoom_level) AS count, ' +
                         '? AS expected ' +
diff --git a/bin/mbcompact b/bin/mbcompact
index 9101421..0bd8f9f 100755
--- a/bin/mbcompact
+++ b/bin/mbcompact
@@ -28,7 +28,7 @@ Step(
     function() { mbtiles = new MBTiles(filename, this); },
     function(err) {
         if (err) throw err;
-        mbtiles.db.all('SELECT name, type '
+        mbtiles._db.all('SELECT name, type '
             + 'FROM sqlite_master '
             + 'WHERE type IN (?, ?)',
             'table',
@@ -47,13 +47,13 @@ Step(
     },
     function(err) {
         if (err) throw err;
-        mbtiles.setup(this);
+        mbtiles._setup(this);
     },
     function(err) {
         if (err) throw err;
-        mbtiles.db.get('SELECT COUNT(*) AS total FROM tiles', this.parallel());
-        mbtiles.db.run('PRAGMA locking_mode=EXCLUSIVE', this.parallel());
-        mbtiles.db.run('PRAGMA journal_mode=TRUNCATE', this.parallel());
+        mbtiles._db.get('SELECT COUNT(*) AS total FROM tiles', this.parallel());
+        mbtiles._db.run('PRAGMA locking_mode=EXCLUSIVE', this.parallel());
+        mbtiles._db.run('PRAGMA journal_mode=TRUNCATE', this.parallel());
     },
     function(err, row) {
         if (err) throw err;
@@ -64,7 +64,7 @@ Step(
         var done = this;
         var doit = function(limit, offset) {
             process.nextTick(function() {
-                mbtiles.db
+                mbtiles._db
                 .prepare('SELECT tile_data AS tile_data, zoom_level AS z, tile_column AS x, tile_row AS y FROM tiles LIMIT ? OFFSET ?')
                 .all(limit, offset, function(err, rows) {
                     var images = [];
@@ -92,8 +92,8 @@ Step(
                     }
                     Step(
                         function() {
-                            mbtiles.insert('images', images, this.parallel());
-                            mbtiles.insert('map', map, this.parallel());
+                            mbtiles._insert('images', images, this.parallel());
+                            mbtiles._insert('map', map, this.parallel());
                         },
                         function(err) {
                             if (err) throw err;
@@ -123,17 +123,17 @@ Step(
     },
     function(err) {
         if (err) throw err;
-        mbtiles.db.run('DROP TABLE tiles', this);
+        mbtiles._db.run('DROP TABLE tiles', this);
     },
     function(err) {
         if (err) throw err;
-        mbtiles.db.run('CREATE VIEW IF NOT EXISTS tiles AS '
+        mbtiles._db.run('CREATE VIEW IF NOT EXISTS tiles AS '
             + 'SELECT map.zoom_level AS zoom_level, '
             + 'map.tile_column AS tile_column, '
             + 'map.tile_row AS tile_row, '
             + 'images.tile_data AS tile_data '
             + 'FROM map JOIN images ON images.tile_id = map.tile_id;', this.parallel());
-        mbtiles.db.run('VACUUM', this.parallel());
+        mbtiles._db.run('VACUUM', this.parallel());
     },
     function(err) {
         if (err) throw err;
diff --git a/bin/mbpipe b/bin/mbpipe
index 5efbd3f..f06d8b2 100755
--- a/bin/mbpipe
+++ b/bin/mbpipe
@@ -36,22 +36,22 @@ Step(
     function(err) {
         if (err) throw err;
         Step(
-            function() { mbtiles.db.run('PRAGMA synchronous=0', this); },
-            function() { mbtiles.db.run('PRAGMA locking_mode=EXCLUSIVE', this); },
-            function() { mbtiles.db.run('PRAGMA journal_mode=TRUNCATE', this); },
+            function() { mbtiles._db.run('PRAGMA synchronous=0', this); },
+            function() { mbtiles._db.run('PRAGMA locking_mode=EXCLUSIVE', this); },
+            function() { mbtiles._db.run('PRAGMA journal_mode=TRUNCATE', this); },
             this
         );
     },
     function(err) {
         if (err) throw err;
-        mbtiles.exists('tiles', function(err, exists) {
+        mbtiles._exists('tiles', function(err, exists) {
             if (exists) table = 'tiles';
             this();
         }.bind(this));
     },
     function(err) {
         if (err) throw err;
-        mbtiles.exists('images', function(err, exists) {
+        mbtiles._exists('images', function(err, exists) {
             if (exists) table = 'images';
             this();
         }.bind(this));
@@ -59,7 +59,7 @@ Step(
     function(err) {
         if (err) throw err;
         if (!table) throw new Error('No usable image table found.');
-        mbtiles.db.get('SELECT COUNT(tile_data) AS total FROM ' + table, function(err, row) {
+        mbtiles._db.get('SELECT COUNT(tile_data) AS total FROM ' + table, function(err, row) {
             total = row.total;
             this();
         }.bind(this));
@@ -73,8 +73,8 @@ Step(
         var doit = function(table, limit, offset) {
             process.nextTick(function() {
                 var query = table === 'images'
-                    ? mbtiles.db.prepare('SELECT tile_data AS tile_data, tile_id AS id FROM images ORDER BY tile_id ASC LIMIT ? OFFSET ?')
-                    : mbtiles.db.prepare('SELECT tile_data AS tile_data, zoom_level AS z, tile_column AS x, tile_row AS y FROM tiles ORDER BY z, x, y LIMIT ? OFFSET ?');
+                    ? mbtiles._db.prepare('SELECT tile_data AS tile_data, tile_id AS id FROM images ORDER BY tile_id ASC LIMIT ? OFFSET ?')
+                    : mbtiles._db.prepare('SELECT tile_data AS tile_data, zoom_level AS z, tile_column AS x, tile_row AS y FROM tiles ORDER BY z, x, y LIMIT ? OFFSET ?');
                 query.all(limit, offset, function(err, rows) {
                     Step(
                         function() {
@@ -95,14 +95,14 @@ Step(
                                 child.on('exit', function(code) {
                                     if (code) return callback(null, null);
                                     if (table === 'images') {
-                                        mbtiles.db.run(
+                                        mbtiles._db.run(
                                             'INSERT OR REPLACE INTO images (tile_id, tile_data) VALUES(?, ?)',
                                             row.id,
                                             row.piped,
                                             callback
                                         );
                                     } else {
-                                        mbtiles.db.run(
+                                        mbtiles._db.run(
                                             'INSERT OR REPLACE INTO tiles (zoom_level, tile_column, tile_row, tile_data) VALUES(?, ?, ?, ?)',
                                             row.z,
                                             row.x,
@@ -126,7 +126,7 @@ Step(
                             if (rows.length === limit) {
                                 doit(table, limit, offset + limit);
                             } else {
-                                mbtiles.db.run('VACUUM', function() {
+                                mbtiles._db.run('VACUUM', function() {
                                     sys.print('\n');
                                     console.warn('Pipe complete.');
                                     done();