I think you're correct. It was mostly from over-tightening the tripod screw. The 'fix gives a "beefier" platform for the tripod screw, while not allowing the base to flex (no pun intended). Many years ago, I used to help a guy who repaired cameras, and bought/sold at camera shows. Whenever a Rolleiflex was offered to him, the first thing he would do was check the back. He could always tell which ones were used with the 'fix, and which weren't.