It takes both the angle braces and the mounting points on the rear of the moldboard of the frame to control the slop. The pins don't have as much to do with it since they must be loose fitting enough to allow for tilt.
I have an old 9U with a 6S dozer. The outer "ear" on the back of the moldboard where the lower pin goes through the front of the push arm was broken off and welded back. Probably not reattached perfectly and over time there is lots of side to side slop in that joint that doesn't help keep the dozer from moving side to side..
No idea how easy to find push arms better than what you have. But would be the easy way. But the different parts of the trunnions are sold,you cut the old and weld in the new.
On other brands where trunnion parts are not available people have welded and ground things down to take slop out of the blade too.
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