I need to compile a definitive list of bass guitars with "fine" 24-spline shafts and those with "coarse" 18-spline shafts, in order to determine production levels of a new range of tone controls. I can find only general information, such as USA-made basses use 24 splines, and Epiphones use 18 splines. I need data that is more accurate than this. For example, the shafts of some basses of the same brand may differ, depending on where or when they were made. So, I'd be very grateful to owners of basses with splined shafts, who can tell me the following information, so that I can discover the popularity of their instruments:
(1) Make, (2) Model, (3) 24 or 18 splines, (4) Country of manufacture, (5) Year of manufacture.
Thank you. The results will be made public for the benefit of all.