C Spanner

[Human_Amp]

There is some chat and pictures about c spanners, and lock rings etc. in an earlier thread

Adjusting belt tension?

Those C-Spanners are not necessarily bike tools - I got mine from a general hardware store, I think the ‘ring’ could be called a ‘lock ring’ ? Snubber gap to back of belt should be as small as possible without being in constant contact with the belt. 0.25mm would be about right 0.75 or 1mm too big. If you belt has been running with loose snubber and tension for some time (ie regularly popping) it may be possible you have damaged a few kevlar cords - reducing the belt’s stiffness and so making i…