Vince Gironda demonstrating the dip machine to Larry Scott.
Vince had a dip machine in his gym in the early 1980's. It was like a hack slide but you used a seat belt to hold yourself on. You could plate load it and it had 3 positions for hands.
I asked him if I might be able to just hang around the gym and check things out for a bit.
His reply was "Sure if you'd like, just don't feed the animals".
A big animal I did see - big Louie on a dip machine!