Are you keeping an older or vintage bicycle going? These various thread-on freewheels for threaded hubs may be of use to you (these are not cassettes for freehubs - see https://en.wikipedia.org/wiki/Freehub for comparison between freehub and freewheel hub). 14 tooth to 28 tooth, 6 speed thread-on (1.37 x 24tpi "English") Shimano New Old Stock $15 14 tooth to 32 tooth, 6 speed thread-on (1.37 x 24tpi "English") SunRace New Old Stock $15 13 tooth to 28 tooth, 7 speed thread-on (1.37 x 24tpi "English") SunRace Sturmey-Archer New Old Stock $15 13 tooth to 28 tooth, 7 speed thread-on (1.37 x 24tpi "English") SunRace Sturmey-Archer Used but in good condition $7 13 tooth to 24 tooth, 7 speed thread-on (1.37 x 24tpi "English") Maillard Used but in good condition $7 See top view photos, and edge-views of the teeth of the two used freewheels.