another idea that i use on any equipment that i purchase:

engrave: stolen from insert name here and includea phone number plastic items can be engraved also with a soldering iron or high speed grinder. may not stop a thief (who can[:@]), but i have gotten a piece of equipment back once, the would be thieves must have seen my engraving and they ditched a 400$ weed eater in a mans front yard and he called to tell me he had it, thank goodness there are still some honest folks out there