I have a chronic reoccuring problem with my rear campy record brake. When I activate the lever, both brakes pull in against the rim, but when it releases only the left side moves away, the right side stays against the rim. I have checked both the attachment bolt and the lock nut and they seem tight. When I take it totally apart and put it back together it temporarily fixes the problem but I am not sure why. And before you suggest taking it to the lbs, it was at the lbs for a tune up less than a month ago, and not being an owner of multiple bikes, I hate to be without it for 2-3 day turnaround time usually found at my lbs in the middle of the season. Any thoughts?