Sorry, I'm not clear on this. I understand that the vacuum platter cannot make a seal on the 10 inch record. So, what's the problem with turning the pump off, and just playing the 10" record? At least your VTA would be correct. That would seem to me to be more important than the vacuum clamping, perhaps use a standard spindal weight? Like you would on any other 'table? Can you hear a major difference between playing a 10" laying flat on the platter, or the 10" laying on top of the 12" that's vacuum clamped?
I remember some super cheap records I had as a child, Superman serials from old radio broadcasts. The vinyl was nearly as flimsy as a piece of paper, super thin. Perhaps that would seal and not increase your VTA appreciably? If you could find one.
I remember some super cheap records I had as a child, Superman serials from old radio broadcasts. The vinyl was nearly as flimsy as a piece of paper, super thin. Perhaps that would seal and not increase your VTA appreciably? If you could find one.