First use of TBC230 for homeowner use only. While trimming I noticed that the right side of my right forearm suddenly got very hot. I remember I reacted by pulling my arm away from laying against the trimmer engine. After I finished and a few hours later, I noticed I had a burn in the skin on the side of my forearm about a 1/4 inch in diameter. It was in an almost perfect circle. The trimmer had cooled off so I wasnt able to check for a hot spot. But when I pick up the trimmer and hold it as I did the first time I used it, I observed that my long forearm laid back onto the engine and that the burn spot on my forearm matched up with pressing on the plug wire that runs across the face of the engine. When I use it again, I will try to determine what it is that is getting so hot as to burn a hole in my skin. I know it wasnt from the exhaust. Can a plug wire get that hot?