Disk Brake Shim/Collar for Old Steel Frame

I ordered a disk brake conversion kit (just the bracket). Unfortunately it placed the calipers at an undesirable angle and position. I designed and printed a collar/shim that would 1) take up space between the over-sized mounting collar. and 2) provide a straight and vertical position for the collar to grip rather than the angled position of the frame itself.

The end result is a brake caliper that is positioned correctly and was much sturdier than with rubber "sleeves". As an added plus the