Lars, thanks for posting this; I do not own a Presto Lyon and probably never will. It is nice to see how things like this work through video.
BTW, for those of you who do not know......I have been doing this sort of thing for quite a while (using You Tube to talk about cuffs and explain their funcions). You guys can check out my You Tube account here:
http://www.youtube.com/user/amazing4928
Most people here will have an interest in all the handcuff videos but there is a lot more stuff on there......magic, escape, and comedy stuff too. Feel free to have a look.
Cheers, Mike D~C/