I have a VPI Scoutmaster turntable with JMW-9 tonearm. I am able to acquire a VPI 10.5 tonearm. How easy is the tonearm swap between these 2 tonearms? Please excuse my inexperience on this matter.
I'm not sure you could achieve proper cartridge alignment with a 10.5 on a Scoutmaster without drilling and moving the base, but I'm sure someone here can say for sure.
As to how easy, it depends on your level of experience. The s-p distance for the 9 is 223 mm, for the 10.5 258. "Spindle" in this case is the platter spindle, "pivot" is the tip of the spike the tonearm rests on. To install the 10.5 you have to remove the base, move it so that the s-p is 258, then mark, drill, and tap new holes for the base.
Maybe building the 10.5 as an outboard 2nd arm will be best
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I'm not sure you could achieve proper cartridge alignment with a 10.5 on a Scoutmaster without drilling and moving the base, but I'm sure someone here can say for sure.