Product details:

Get even more out of your G&L or MusicMan bass with the BT1! This unit will fin in an 11/16" headstock hole and has an option for regular or short tuning key. The short tuning key option fits US made G&L and MusicMan basses while the standard key retrofits the Schaller BML tuning machine. Installation instructions and mounting hardware included. The BT1 can be upgraded to include a Double Stop lever.