Hi, I need to adjust the rear preload without the stock tool. I can't order exotic parts from online as I need it to be done today and I won't get that in time, so what common tools work? I have a C Spanner but it's much too big to go in the slots. I could buy a new tool as long as it's easily findable in a shop but don't know what tool.

A hammer and flat screwdriver will do.

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