Might be a daft question but do you have any regular bolts to test with?
Not a daft question at all, but yes, have already had a rummage through the bits box - although I have just remembered I have a set of canti's somewhere with grub screw adjusters. I'll try and find them tomorrow and see if any good.
@floatingcyclist started
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Might be a daft question but do you have any regular bolts to test with?