This is an STL file for 3D printing a low profile bracket for MHGH28-XTC adapters.
Seems good (so far), when printing in ABS at 0.1mm.
I have several low profile adapters from eBay, and needed some full height ones. So, my first thing to do was model this (note the simple through holes, not proper threads).
Then I lengthened the backing piece + adjusted the screw position into a full height one, available here:
Putting these here in case they're useful for other people too.