I have one. I do not have the instructions and can't find the unit on the web to copy off instructions. I would like to know how to use it properly.
It seems to me that I can make any cassette new or old be 'sticky' and hold the chain. I was working under the impression that the tool was to check if a cassette was worn and 'held' the chain to much, not allowing it to release to the next gear smoothly.
I need to know how much pressure to hold the gauge/tool to the cassette with.