It is actually quite easy to re-thread a FCS hole (or a future one I guess). See:
www.gong-galaxy.com/forum/viewtopic.php?f=32&t=3359key points:
- create a rough surface before applying resin (e.g. rethread with a bigger tap, scratch it with a tool, ..)
- resin with charges: miscrospheres, cut fiberglass, fillers, ... to have the end result as hard as possible
- let it harden as much as possible: remember that epoxy hardens as much at 40C in one hour than at 20C in one week. I use a desk lamp above the repair once hard to keep it at 40C to cure it
- take your time to drill. Use progressive sizes drills