I've been thinking about this as I'm half way through a build and know the scope mount with the single screw is very unstable. I seem to remember reading somewhere years ago that the hoth scenes were filmed after the bespin scenes by which time the prop was damaged by continually tightening the single hand wheel, the prop guys took the gun and drilled three holes and bolted the hole thing back together with a disk glued on to cover the central hole. (Maybe this has been debunked now it must be 20 something years since I read it).
I was thinking of using a couple of pins to lock it in place.
C.
very interesting! The Hoth scenes used an MGC metal replica, and the Bespin scenes used a couple Live mausers. There may have been a stunt that this happened to.
What I've heard recently was that MGCs were used when they couldn't import live weapons like when filming in Norway or moving to the states for ROTJ