I will be interested to find out how valuable the led pre-alighnment turns out. I've thought about doing this myself, but I can't help but think that there is no way to make sure that the pen laser is on the exact same axis of the CO2 laser once you swap them out. I mean, they will be close, but I would dare say it would be just dumb luck if one got the CO2 laser put in there and it was aligned to a good focus right off the bat. My question is whether or not it is worth the time/expense/effort for a guy (mainly me) without any CNC stuff available here to try to use a red LED laser to align the stuff given that I am relatively certain I am going to have to do it again after taking out the red laser and putting in the CO2. Is the idea that one is just getting the CO2 laser close enought that it hits the mirrors and such without bouncing around dangerously or are you expecting to get a true alignment out of it? Just curious if you've thought about it and what your stratagy is. I have been seriously thinking of asking bart or one of the fab shops to make me something simmilar, but I'm not sure what I will gain. I don't mean to sound at all accusatory by my comments/questions, I am trying to make up my mind and playing a bit of devils advocate as well as hoping you have a really good strategy to address these concerns as the alignment part of this project scares me some (if there's a chance for me to get hurt it would be here... through the years as a scientist I have seen some aweful laser accidents).