First post, and something I know a little about The "how it's done" is the easy part! the hard part is doin' it right!
First, get some screws of the appropriate length. Heat them up to anneal them and make them soft enough to "peen". Then Countersink the offending holes until you have a chamfer that removes ONLY the thread that is closest to the surface, amy more and you have a LOT of peening to fill it, any less and it won't fill properly. Grind the ends off the screws you're going to use, reasonably true is good enough... screw them into the holes, about .075 to .100 over the surface you're blending to, using some ultra heavy duty stupid strong loc-tite as you go. Support the frame from inside the dust cover to keep from crushing it... This is IMPORTANT! Use a small ball peen hammer to pound the screw until it expands to fill the chamfer you cut.
File flush, and finish.
Done right you will not be able to see the repair. Done wrong.... well, that's expensive!
Hope this helps, perform at your own risk!
Ken