While replacement Side Plate Screws are not hard to come buy, almost all buggered screws CAN be fixed up to look like new in a few minutes with a bit of practice. The replacements have started getting a bit pricey too!
All that is needed are some simple tools, some skill, practice, common sense, and about 15 minutes if your time per screw.
Tools needed:
A small Ball Peen Hammer
Miniature File set (small / thin) - some with cuts on edges, some safe edges)
Dremel Moto-tool with a thin cut-off abrasive wheels
Small Arkansas Stones (called "files")
Flitz Polish
Brownells Oxpho Blue Cold Bluing
If you are fairly good at using hand tools, restoring screw heads are easy, fun and rewarding. It also saves you the hassle of constantly having to look for new screws. I use this method on man screws and not just for firearms. I collect and restore many types of antiques such as vintage electric fans, telephones, radios, Lionel Trains, tools, etc. and only in very severe situations do I ver have to replace one. That's a good thing since many of the older screw styles are not even readily available these days!
NOTE:
Blues donor screws can easily be high polished and will look like Nickel Plated ones if needed. They can also be polished to a satin finish to look like stainless steel if desired. Because they are polished up so well, they won't rust on you even with no bluing! There have been a few vintage Nickel Plated Revolvers that I could not find replacement screws for and the original screws were just beyond restoration!! I used Blued versions and polished them to look like Nickel - sometimes I forget myself that they are not Nickel Plated! Flitz Polish and a Dremel with Felt Wheels will do this in short order. Works incredibly well!!