My original ][ uses a 1979 model 2 Keyboard with Datanetics DC-60 switches (straight stem).
Many of them do not return true and are not making proper contact. I hand jumpered the solder points to identify that the encoder is fine, and that the mecanism works properly. THe only issue is that the keys do not return to their false state, so the matrix is corrupted by partially closed gates.
What is the best product to use to lubricate them? I considered dielectric grease, but that is too heavy and I would expect it to result in the key column sticking worse than it does not. It could also leak ontot he contacts.
Have any of you restore these switches? I suppose that replacing the springs may help, but I'll need to figure out what the desired spring size and tension is first, then hope that the spring company that I worked with years ago is still in business.