Hi JOE! I used to use my MOMs' iron way back when on Monokote. If your plane is used, you need to get it sqeeky clean before you knife into it. I don't think there is a better cleaner than MEK. You can get it at HOME DEPOT. You should be able to install a new mount with out knifing in. The new blind nuts can be fished in by sending 1/16" music wire through your new holes. When the wire shows up in the radio compartment, slide a blind nut over the wire, then bend a sharp 90 in the end of the wire. now all you have to do is pull the wire back to seat the nut. carefully thread a bolt and flat washer into the semi seated nut to finish clamping it in place. Back to MONOKOTE,you want to creep up on the right temp with an unknown covering to get the adhesive to activate, or to get it to shrink. If there is even a trace of oily film on the original covering the patch won't hold. It takes lots of effort, and lots of paper towels to get an old slimy surface ready.