A little flummoxed on this one. I'm building a Rickenbacker 4003/4004 clone of sorts, but all wood top, no pickguard. I've left the top wood thickness at 1/4" over the control cavity, the cavity depth is just under 1" clear. I ordered some 250K CTS pots for it, but the threaded portion of the shaft is only 1/4". All the other ones I've found online described as Long Shaft have a 3/4" threaded sections, too deep for my control cavity. I could use a forstner bit just bigger than the pot body diameter to sneak another 1/16" or so out of the wood top thickness, but it makes me nervous. Is there a "medium" threaded shaft version, something like 3/8"? If so, I can't find one online from the usual suspects. I'm using set-screw knobs, so it needs to be smooth-shaft, 1/4" diameter. Thanks for any leads or advice!