On the bottom case of the Commodore 64c, there are screw mounts to secure the motherboard to the case. It's common for these mounts to break off due to age. I had a need to make a few of these for my case. After several iterations, I settled on this design because they are wide at the base and can be easily glued to the board. Also, I made them through hole because the original mounts were like that. They seemed to work well for my Commodore 64c. I don't know if they will work on the breadbin though.
C64C_Screw_Mount.stl | 29.0KB |