Retrofit your Japanese made Fender for drop tuning with our BT10 Xtender key.
Please note: the BT10 does not retrofit the Geddy Lee Jazz Bass (even though it is Japanese made). TheBT2retrofits the Geddy Lee bass.
Not sure which Xtender to buy? We are here to help! Send photos of the front and the back of your headstock to [email protected]





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