The 'side-arms', there, swing up and 'clasp' the sides, so the vertical-positioning is stable during epoxy-cure.. Finally had a minute to stick an 6800-X body in there, to show 'how it works'..
..Yes, the "mirror" in this shot is faked - Just a quickie photoshop comp (I didn't have any 'loose' X or Y's, with mirrs, and did not wanna take one out of a working Pj just for the photo-shoot..) But, I'm sure you get the point, ya? Quick, easy, and stable..
..Lemme know if you wanna 'borrow' to model / print, for the benefit of the Comm, and I can send it up in a small flat-rate..
fwiw..
j