Mark, I was looking at the tanaka website and was reading about the warranty, and under the "does not cover" points: 5. Repairs made by unauthorized parties and/or with unauthorized parts what exactly does that mean? does it mean you void your whole warranty, or ony failures caused by that part? if a failure is caused, how do you proove that the aftermarket part/dealer caused the failure? example: say I put a echo speed feed head on a tanaka trimmer, and the gear case failed. what would happen here? would the gear case be replaced no questions asked, or would I have to prove that my trimmer head/not running short enough line caused the failure, and premature wear? my other question, is about taking parts OFF. example: say you took the guard off your trimmer, and the gear case or engine failed under the warranty period, would the engine still be covered, or would the whole warranty be voided, and I would be stuck with a bad engine? or would you have to prove that removing the guard caused a failure? and then lastly, what if an autherized tanaka dealer removes the guard? just curious. :blob3: chris.