Ok, so I've got a lot of flex mounts, some of Dave's and some of Rob's, and all of them exhibit a tendancy to move on the baseplate when adjusting.
No matter how hard I bolt them down (whilst ensuring no threads are stripped!), I still sometimes get an involuntary 'letting go' as I try and tweak one of the axis, resulting in the beam being way off. the ones from Rob seem to be a bit worse as they have a 45 degree cut at the back, which leaves less metal to metal contact between the baseplate and foot.
So, is there a tried and tested way to fix these down better? Once they're in place, they don't really need to move, so I'm thinking epoxy, maybe solder of some sort to hold them fast and solid. Am I the only one who experiences this?