I want to make an 1/8" steel rotary switch shaft into 1/4" so that it will accept the much more common 1/4" shaft knobs.
If I use McMaster-Carr 92510A422:
which is an aluminum unthreaded spacer that has an ID of 0.115", will heating it expand it enough to fit the 0.125" shaft?
I have a 13" drill press but otherwise, I do not have any ability to mill things so I need to start with off-the-shelf parts.
I just realized, the nut that goes over the shaft has an ID of only 0.2175". So it would not fit over the new shaft.