Originally Posted by
owenmyers
I have a 13t replacement cog for Suntour.
Note that these early Perfect (and ProCompe) freewheels had a larger threaded diameter for the small cog(s), so any 13t Suntour cog you find will almost always be from one of their later freewheels with the smaller thread diameter.
Earlier Shimano Freewheels also had a larger thread diameter than their later offerings, and I've never seen one of those with a 13t.