Repair range element switches?
In my humble opinion, it isn't a good or safe idea to try and fix them. The bi-metal that controls the heat range of the burner is more than likely fatigued and can't be replaced. The switches are bracketed together in such a way that they are not meant to be taken apart and if you do, it's hard to get them securely put back together. Even if you could repair it, it would only be a temporary fix and could go out at any time or really over cook your food. Just get some new switches and do the job right.