1. tq for the design..but acutually i have that idea before..this is my design (using words and spring) : but i sure have same prop to use this.. 2. i actually make electronic drum using usb pc keybord : [img width=680 height=480] 3. the function is same like my first design (LED).. just want to make switch.. 4. this drum work when wire A connect with wire B (and send signal to pc) like this : [img width=680 height=480] any idea..???