By far no expert for the most part can make a saw run . The rumor is I can fix stuff . What I get people want me to work on junk. Not sure of all the names ?All I say I won't touch it . I get the stink look . I got about 2 hours of working on the neighbor weed wacker with parts out of my stash . The only question I have . Why put up with this stuff ? My weed eater is about 20 years old got a mantis tiller about the age got chainsaws for the 1980 shish that will run with little effort . All I was thinking was buy a echo or some new battery model . What I heard some one pulling on a weed eater not starting . Nope not going to help .