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@Hefty
Mostly when my bike makes those sorts of noises it's the crank arms working loose against the BB, probably because they are old and the taper is worn.
I remove the crank arms, clean and grease interface between BB and cranks, do up FT, ride for a bit, do up FT again and it goes away for a few months. One day I'll get new cranks and BB, but not today.