ps2's were a pain in the ass to change the lasers, i would know i used to do modding and repair business. The lasers you used to get were just recons and the pots wearnt adjusted so you used to have to sit there and tweak them, or get an osiliscope and do it that way a big pain in the ass! I used to like doing xboxs so easy swap the old dvd rom for a new one and wolla! jobs done! not the case on the 360 tho but hey.
Good luck!