Replacement parts are always available. With the Further it's a bit complicated as there have been many updates to the circuits involved.
The switches now are on a circuit board with a zero sum amplifier so there isn't a volume change with a pickup selection change. But to have this update, you would really need to send the guitar in because there are small internal modifications needed to get all the new stuff to fit.
But if you just need the switch components themselves, just call or email me and we can get you what you need.
