Originally Posted by
juvela
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the machine's Juy forged gear hanger is unthreaded
run a 10.0mm X 1.0 tap through it
then grind/file a stop in the perimeter at the seven o'clock position and "Robert will be thine uncle"
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... or hack off the derailleur tab and use a claw.
Lots of Simplex dropouts suffered that mutilation.
When I went to hang a SunTour Cyclone II on my 1980 PKN-10, I happily noted that Simplex had switched to a threaded setup that can accommodate a variety of rear derailleurs. When I gave the bike to my son, I put the Simplex back on and kept the Cyclone. He got the wider gearing he wanted, and I put the Cyclone on my UO-8. (Works fine on a 13-26 6-speed as long as you go half-step up front.)
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"Far and away the best prize that life offers is the chance to work hard at work worth doing." --Theodore Roosevelt
Capo: 1959 Modell Campagnolo, S/N 40324; 1960 Sieger (2), S/N 42624, 42597
Carlton: 1962 Franco Suisse, S/N K7911
Peugeot: 1970 UO-8, S/N 0010468
Bianchi: 1982 Campione d'Italia, S/N 1.M9914
Schwinn: 1988 Project KOM-10, S/N F804069