28 Threads per inch ashtabula cranks
So I've got a nice One piece schwinn crank as was recomended by someone on this forum. I didn't know the assembly parts (cones, cups, retainers) were different from the regular type of crank. They use 28 threads per inch as opposed to 24 threads per inch on the regular one piece cranks. Anybody know where I can get a set or have a set I can buy? Also, the pedal threading is half inch instead of the regular threading. Any suggestions welcome.
Nobody around for help? Anything?