I found locks that use the 4 digits the best. not the ones that require you to turn the dial. but we went to the type that require 4 digits. we just turn the first digit 1 click to lock it. no theif would hang around long enought to figure it out. a key is nice but keys are lost, left at home, and the list goes on. let me explain about my above comment. Yes money in the pocket is always better. But - how much are you going to send to lock up your $200 line trimmer? chain, locks, trimmer traps. it all costs money. then add the time spent locking and un locking - how much does that add to it? my guess over the course of 2-3 years it could get pricy just to secure a $200 line trimmer. I understand that back back blowers cost more, but the pinciple remains the same. realistly 2 cycle equipment is a drop in the bucket to replace. I dont like doing it, but it really isnt that much. I burn more fuel in a week than the cost of a line trimmer. now consider this. $200 new, runs great year 1. with new carbs and gas being crap, by year 2 needs new carb ($50.00) also needs a new head ($30) and then needs a pull starter ($30.00) how much money do you have to put into it just to get it running good for year 3? my guess is with mechanics labor, parts and down time an average of $100 on a $200 machine. Whats this mean. Either way by year 3 im going to have to spend $100 on parts..... or I can just go buy a new one for an extra $100 in cost. Well Im pretty sure that I would be able to tax deduct the stollen equipment??? (id have to ask my accountant) and I know that I would be deducting the new equipment. I was going to spend $100 on parts. Suddenly take all this into account, and im not fare off to buying a new unit. the big bonus is new peice of equipment with less break downs. the bad side is that formaula only works with small equipment where average maintenace cost is $25-50% of the new unit price.