Loading it horizontally is a much better strategy than what I’ve been doing and the slots and off center clamps only make it worse.
Coil springs around the main screw between the top and bottom part my clamps would help a lot but I don’t think I left enough room. They’re so light maybe hot melt glue or putty would hold them long enough to get the work in place.
Thanks for the tip!
Good ideas; hot melt glue or putty, how about neodymium button magnets?. When I use a faceplate it's for multiple parts, so I mask off or affix rails to re-locate each.
...we'll learn more by wandering than searching...