There is a product I've been looking at to repair the ceramic on the switches.
http://www.flexbar.com/shop/pc/AUTOCRETE-1LB-JAR-82p4026.htm Spec wise, it looks good and appears easy to work with but I have no present need and too many other projects going now to play with it. If you take the switch to someone for repair or someone on the forum wanted to offer an opinion, or get some and try it, I would be interested in hearing results. If broken, the smallest ceramic rod I've found so far is 1/4" dia and I think a bit too large--although the Autocrete can be molded & might work just as well.
Nichrome wire is also plentiful to redo the resistance winding if broken--just need to get the size and some particulars on what is there. If an already coiled length is not readily available, then not a big job to coil the proper length and size on a lathe or even by hand like making a spring. The proper rivets to mount it on the other hand, are proving a little more challenging.
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