Thanks for your interest 
Fine that you like tech talk; here’s another hint regarding the EVO beltwheels…
For whatever reasons it might be required to unmount/mount the adapter ring
(shown below the backside of an original plastic beltwheel), by loosening the four bolts -
which isn’t that complicated,
BUT for tightening them again
it is absolutely necessary to treat the four threads with greatest carefulness!!
otherwise the spider (or beltwheel) is done, a little too much torque and the threads are ripped off - you’ve been warned 
(Shown accidentally at the outside; should be mounted at the inside.)