Hydraulic Press safety questions

I had an accident with a 12 ton HF. I was using it to press in the ball joint on a VW Beetle control arm. A cast iron work plate that came with the press, split and the jack popped out of the retainer. The jack went 12' past my right shoulder, bounced up and damaged a car door. The jack went so fast, I did not see it. How it got past me I will never know.

I learned not to trust the 3/4" thick cast plates. Steel is a much better alternative.

Wow, I just bought the 20 ton and it has those plates. Me thinks I'll be hitting the local steel shop to pick up some small steel plates now.