I hesitate to post this as an answer because it doesn't directly answer your question, but it does answer your overall problem.
Do not rely on a laser as a finder. Any dark site will have rules against using them, as they will interfere with other's use of the site. It will affect yours and other's night vision. Ruin photos of people imaging anywhere you point it.
Using one in your own light polluted back yard may seem ok. But eventually you're going to want to go to a dark site, and you'll need an appropriate finder. If all you ever used before your visit is a laser, you're going to waste your time at the dark site learning or fiddling with something new.
Invest in a good finder, and get adept at using it. I use a Telrad on pretty much avery scope I own. You should ask for recommendations from other too, but don't prefix the question by saying it has to be a laser.
Lasers are fine tools at public events used as pointers (in the hands of resposible opperators). But that' pretty much it.