You might be interested is seeing a rare clip of David DeVal's escape from the Revolution Roller Coaster, at Blackpool Pleasure Beach, here in the UK back in 1984. I supplied the locks. Please excuse my sideburns! They were in fashion in 1984!
Here's the link; Enjoy;
http://www.youtube.com/watch?v=9E0jwmAEd08
Anonymous (I wish people would be brave enough so they didn't have to hide under that name)
Here are the answers to your questions and comments. I supplied the 2 padlocks. There was only 1 key for each which were held by the producer as soon as he was locked in. The mask and the thumbscrews were supplied by the other guy, and the cuffs by the lady.
The key to the cuffs was quite big, so it wouldn't have fitted inside a cavity in the thumbscrews, even if there was one, but there wasn't, as I examined them and even tried them on.
Regarding the presenter"Helping" him out of the mask, David got the lock open, and out of the shackle on the hasp. His difficulty was in lifting the hasp from the shackle, as it was quite stiff and David was disorientated after going upside down 3 times. She just lifted the hasp as she could see it and David couldn't.
I hope that has answered your comments.