ok...also the focus lens part of it something inside rattles...and sometimes when i shake the laser the focus goes WAY out and i have to take it apart to fix...What happening here?
Theres not way to tell, it depends on how it is hooked up, take some like aligatorclips then clip them onto the spring and one onto the casing itself, then take 2aa batteries and put them in series with the negative going to the spring and positive to the casing, then you can just turn the pot different directions and see which one makes it brighter.
Warning: Keep in mind, changing the pot means overdriving the laser. Adjusting the pot is likely to kill your laser right then and there. Even if it doesn't, it'll significantly decrease your laser's life. Don't ever mod anything you aren't 100% comfortable tossing in the trash