A recent post (that now I can't locate) about Simplex dropout derailleur hangers reminded me of a solution to this problem that I posted in the ISO thread a few months ago. Re-posting here to increase its visibility for anyone who is still futzing around with Simplex RD's.
Stripped Simplex hanger bolt fix
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72 Fuji Finest 72+76 Super Course, 72 Gitane Tour de France, 74 P-10 & 79 Tandem Paramounts, 76 Grand Jubile,84 Raleigh Alyeska, 84 Voyageur SP, 85 Miyata Sport 10 mixte 89 Cannondale ST400 and a queue