Kinda sux that you only have one sight to adjust. However, if the idea of having the/a correct tool on hand for rainy days and emergencies and friends- I have and trust this one from Brownells: http://www.brownells.com/.aspx/pid=17840/Product/P500-UNIVERSAL-SIGHT-TOOL None of them are cheap, and some folks may recommend a brass or nylon (some type of synthetic) punch and a mallet. There may not be anything wrong with that approach, however, the P500 has teflon jaws and does not mar... at least not yet- on anything of mine. I just feel better about using the right tool for the job.