I solved the problem of my big 54" blade pushing my 520 sideways when plowing heavy snow with the blade angled! Several years ago my neighbor asked me to cut down his basketball pole. It was a 4" square tube filled with concrete and when I got it down the light bulb came on! This could be repurposed as a front weight for my plow tractor. So I cut two sections about 30" long, welded them together and fabed up a carrier bracket which fits in the front tach-a-matic. The weight itself weighs 77# and the bracket adds another 17.5# for a total of nearly 95% up front. The carrier bracket has been modified a couple times and it now doubles as my lateral movement limiter and down travel stop. In the photos you will see the 3/4" rod which engages the slot in my custom built plow frame for sideways movement control and the chain connects to the frame to limit downward travel to maintain engagement of the rod with the slot. Quick on and quick off and it does the job!
One more photo showing the carrier bracket mounted to the front Tach-a-mastic.