those are pretty cool, where did you get them? just got some braided line or something and made it work? that would look really good on suicided doors too.
I dig the magnetic ones, when you open the door it disconnects power but all you see are metal buttonheads sticking out of the sheetmetal. When you close the door the heads make contact again and power is restored.
^^^ we did something like that with two magnets in physics. a simple 6 volt battery to two magnets put together...takes ALOT of force to pull them apart.