Boy does this look familiar!! Ok , Here's a fix. First, get the new switch milled .050 . Then, stuff the hole where the switch goes with cotton or whatever to keep metal from getting into the trans. Then, you will need to bevel the outside lip of the hole with a grinding tool until you can expose more of the 15/16 nut. Install new switch using thread lock . Or, just find a NOS reverse switch. (good luck with that! ).
