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@arup
I've tried the sheldon chainring truing/tensioning method and have experienced some minor improvements but not what I was looking for. When cleaning my chain recently though I did notice that the ring moved away from and closer to the seat tube so it's down to the cranks or the BB. It's annoying because you have to set your tension looser than you would like to avoid the binding, but then it's too loose.
So I'm thinking about new cranks myself but who knows, it could be the BB. How can you tell if it's the cranks or the BB? Don't want to shell out on cranks and then find out it was the BB all along.