Hi. As a first, fixed gear project, I'm converting an older 80s bike. I am trying to put a 16T cog on a threaded freewheel hub and I'm running out of threads for the lock ring (re-purposed BB lock ring). I can start the threads for the lock ring (maybe a thread and a half), but there aren't nearly enough to fully-engage the lock ring and tightening the ring will probably just strip the threads. The 3/32"-16T origin8 cog that I am bought is 7.3 mm wide. Can anyone recommend a threaded cog with a narrower profile (that would leave more threads exposed for a lock ring) that I could substitute? I plan to use thread locker on the cog and a front brake, but I am not experienced enough to judge whether I can overlook a lock ring with this setup. Does anyone with more experience have an opinion? Add a rear brake and a mouth guard? Thanks in advance.