...Since he will need a new RD I'd like to do this reasonably inexpensively. I see online that I can get a 7mm dropout saver for about $20 but also see dropout saver kits for $70.
Do I need a full kit or can I just order a single saver?
Also do I simply use an 11/32 drill bit to widen the existing hole? Should I find a drill press instead of a hand drill? It seems too easy,which is also why I am asking before I go get a dropout saver.
Of course use a drill press if available, to get the hole square. A single Saver should suffice, but this kit calls for a 15/32" bit so check with the one you get. Should work well and easier to install than a Helicoli, which I am partial to otherwise.