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Just wanted to follow-up: The 200Ω resistor did the trick perfectly; the laser looks rad and does exactly what I wanted (thanks styropyro). I'll put a few pics up after I finish up. Thanks again for the help, everybody - much appreciated!

@Silvercookie: That's definitely helpful; I'll be sure to read over the links thoroughly. Couple questions: 1: Are you saying I ought to forget about using the bits I already have? Sadface. 2: If I use styropyro's 200Ω resistor suggestion, would I be able to substitute a 9V for the power...

Thanks for the quick replies! @Styropyro: The "board" is really just a tiny bit of silicon with two leads on it; leading out from the diode, there's a small white bit of "something" inline with the lead that fed the "+" end of the old switch; the switch bridged to another line which led to the...

I'm working on my first experiment with lasers, and with no background in optics or electronics, i'm getting stumped by the simplest problems. I've got a little red keychain laser ptr. that I want to power with a 9V battery; also, I want to replace the momentary button on its circuit with a...