I have six Walker 42" Model "T" mowers and they have all suffered the same fate ealrly in their working life. The plate that the PTO gearbox (for the blade driveshaft and the grass impeller) is bolted to cracks causing one or more of the bolts holding the gearbox to the plate to shear. This in turn causes the box to exhibit excessive vibration. More often than not, when the box is removed, the boss for the screw that holds it down is broken, making the box unuseable. Yesterday, this same thing happened again to a mower that is two years old. This time, as before the boss on the box was broken but I decided to swap the top and bottom halves of the PTO box and filled in the small hole with metal epoxy. Sine the boxes are in the $275.00 range, this seemed like a good idea. After repairing the crack in the plate that holds the pto box and reinforcing it from the bottom, we have never had a repeat problem. Has anyone utilizing Walker mowers ever run across this problem?