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@James1822
OK, there doesn't appear to be a thread on this specific topic, and I've read park tool etc loads of times looking for the answer to this.
When I set up my cantilever brakes I always end up with the main brake cable going towards one side in order to counter the tendency of one of the brake blocks to rub against the rim. I've tried playing with the spring tension adjusters on both sides but this doesn't make any noticeable difference. Also, even when I do manage to get them so that there's no rubbing on the rim, after a few minutes riding they manage to change position and start rubbing again.
At the moment I'm not using a barrel adjuster, so I'll play around with that to see if it makes any difference (but it should be possible to get them OKish without one). Also, I'm considering getting a 4th hand tool.
The wheel is centred in the drop outs and is fairly true. It just seems that one of the spring on one side is stronger than the other, and there's nothing I can do to correct the tension. I'm going to take it all off,clean, regrease and reassemble. But if anyone's got any suggestions that would be fantastic.