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Hey /n/ I'm the anon who had a clicking bike a few weeks back. Turns out it was the pedal. Wellgo design is unsealed, some dirt got in there and pitted the cylinder quite badly (partly my fault for not servicing immediately once sound appeared).
Managed to service them, was a little tricky getting the tightness right to allow free spinning without any play. The job also took me a few hours, but satisfying. Realising that I need a garage when I buy a flat so I can have a bench and some space dedicated to bike maintenance.
So tired now, will try and finish the rest of the service next week (squeeky gear cable)