Hi,
I suggest you get a VTA base for your Rega on the Sota. It will be much more flexible, I think. I had an armboard made for my Systemdek IV (Not IIX) which has a board that's more than twice the size of the IIX. The VTA base I have is An Origin Live. It is far better than the Rega shims, etc. or by adding an additional top plate. It will be stiffer and all you need is an allen wrench and you make your adjustments. It's not on the fly but simple. If you have a Dennison protractor it comes with a clever piece to measure in mm (?) the height of the arm, etc. It makes it easy for you to use multiple cartridges, etc. It's an easy setup. I know this isn't exactly what you requested but I think these two devices will make life easier.
I suggest you get a VTA base for your Rega on the Sota. It will be much more flexible, I think. I had an armboard made for my Systemdek IV (Not IIX) which has a board that's more than twice the size of the IIX. The VTA base I have is An Origin Live. It is far better than the Rega shims, etc. or by adding an additional top plate. It will be stiffer and all you need is an allen wrench and you make your adjustments. It's not on the fly but simple. If you have a Dennison protractor it comes with a clever piece to measure in mm (?) the height of the arm, etc. It makes it easy for you to use multiple cartridges, etc. It's an easy setup. I know this isn't exactly what you requested but I think these two devices will make life easier.