All 4 of my Super A's show evidence of trouble in this area. My grandfather's Super A actually broke the bottom of this housing, causing the left hand universal mounting frame to drop away from the tractor. The other three--Super A-1, white demo, and "old ugly" all show evidence of the set screws being run loose, resulting in them breaking, which required them to be drilled/re-tapped, etc. in some way. In all cases, someone pretty much made a mess!