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@ChrisNW
I don't want to hijack this thread, but is it possible for a spider to become detached from the crank?
I have some '70's vintage SR cranks which seem to have developed a 'click-click-click' as I apply pressure to the pedals. It is the same sound in going forward or in braking, and always just three clicks as the pressure is increased. Once the initial pressure has been applied in that direction, no amount of stamping on the pedals causes any more clicking, even if the chain is tight or slack.
It's not the chain, sprocket, lockring, pedals or cleats. There is no crack in the frame.
BB is tight, square tapers are good condition and uber tight.
What's going on?