In a previous thread I showed how I made a brake adjustment tool using a length of steel tubing, some all-thread and a piece of angle. The tool worked fairly well but had some inherent imprecision due to the tubing not being a real tight fit on the axle threads. This was really obvious on the rear axles due to the threads being worn.   I've modified the tool and it now works very nicely and accurately. Instead of the all-thread being welded to steel tube, it is welded to a 3/4"-16 nut.