I had this idea in school and figured Id show you guys.
Basically what I think is, could it be possible for a magnetic force to push a shield/magnet quickly into one place by opposing a field, which could cause it to attract, and then quickly push it back out of place again?
I figure some of the experts here could have a say, what do you guys think?
edit...
please keep in mind this is just a rough sketch... I could model it in 3d with better parts but you should be able to see the principle... What Im wondering is if someone here already tried this, and if it just doesnt work at all...
I like the Idea, But I think it would equalize if not straight away but after a few seconds.
By this I mean stop halfway.
I think that you should think about electric triggers and using electromagnets along with permanent magnets.
So instead of pullies and wheels you have switches to an electromagnet that is sitting below.
:)
Hope that helps a little.
J