You need a lot of patience working with these. I've done about six installations of Control mounts. George's Son is Running the business now. Spoke to him a few times a pleasure to deal with he's on the ball.
Ditto.
I find it helpful sometimes to assemble both sets of rings on the scope, the center cap oriented properly, then place a piece of tape over the assy, spanning both ring halves and the cap, then manipulating that whole assy into the base female receptacle. Doesn’t work everytime, admittedly, but usually cuts down on some cussing.