What size is BW's joint , Craig ?
Is it .835" too ?
No his is .850" and it is has always been the same for almost 20 years to my knowledge.
All of Billys shafts have consitently fit all the cues he has made since the late 80's, so buying shafts sight unseen is never a problem concerning the fit and he uses a flat faced joint with a 3/8-10 pin.
Oh and by the way, Billy did spend some time with Jerry Franklin in his shop, how long I don't know, but I suspect that is when and possible why he started build his cues using this taper.
Joey, I may be wrong but I have you also use this taper or did at one time is that correct?
Take Care