I mount my DSLR whith this thingy on my NexStar SLT Alt/Az Goto mount. May fit also to other mounts.
I put a support structure into the hole for the screw! Easy to remove with a cutter.
EDIT: There is a bit sturdier version now, comes in two parts, the small part needs to glued in and will prevent random rotation of the camera BUT it needs to be cutomized by filing, modelling or just hot air (as I did ;-) to get a exact fit for the camera used! I designed it for a Nikon D3100 just to find that my D5100 is quite different in that region... grmllbblll.