I am on the fourth Harbor Freight pneumatic angle die grinder in less than 3 months. I don't use it often or hard and keep it lubricated but they keep stripping out the right angle gear set. It is replaced for free each time but I need a pneumatic angle die grinder that I can count on to work when I need it. What right angle die grinder do you recommend that I buy that will last more than a couple of weeks of light use without quitting? What have you used that has lasted for a few years without failing?