Have to ask Jeorg about the vid where the 20mm steel ball bounces back and hits him. I did that once with 1/2" steel and an old tube television; the ball bounced off the screen, and whizzed by my head. Seeing that 20mm impact your head, I'm glad I didn't get hit. (the ball put a large dent in the CRT, but didn't go through.) Glad it didn't hit your eye.