I used his whiteboard project to turn my laptop into a touch-capable laptop. The only thing is that my IR source doesn't work very well. I replaced a keychain L

I used his whiteboard project to turn my laptop into a touch-capable laptop. The only thing is that my IR source doesn't work very well. I replaced a keychain LED with an IR LED but the switch is a simple squeeze and it is incredibly hard to turn it on and get a good signal, so when I'm trying to calibrate it, I usually accidentally click twice and have to redo it. Does anyone have a good idea for an IR pen?