I have several freewheels and a UG freehub that are quiet to silent. All of them work perfectly, except the Sachs 6spd, which has a trick "false neutral" that's nearly taken out the family jewels on several occasions . Needless to say, that one is now enjoying a prolonged rest in my parts bin. Maybe one day I'll tear it down again and see if I can find out what's up, on a second attempt. First teardown was NTF (no trouble found). Perhaps I'll tweak the springs next time, to give them a little extra "oomph".