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@Casp
Any one suffered from their bottom bracket cups unwinding?
I have used an old style cup,bearings and spindle and a modern cartridge bottom bracket and both unwind on the drive side.
My chainline maybe a fraction off but nothing major. On the revolution of my crank the chain does have a spot where it is tighter than the rest of the revolution, i had this problem before and tried changing cranks and chainring and still have the same problem, only thing i haven't tried is changing the cog. i can only assume where it bites is causing the bottom bracket to unwind.
had a search for this problem but couldn't find anything.
Ta