Hello there.
I recently bought a Swiv-o-matic pedal (my first one) and, after cleaning and lubing it, was ready to try that legend. I was adjusting the stroke arm while I was seated in my stool and this is what it happened.
I must say that I did not applied too much pressure. Maybe my mistake was in using the drum key pictured in photo #3.
Now my dilemma is: Buying a replacement or trying to fix it with some welding? What is that arm made of? (that bolt tells us that is a first generation) It looks like aluminum. What do you think? What would you do?