At first, I didnt think this was going to work on my ryobi gas powered string trimmer(weed wacker). I couldnt figure out how to get the housing off the end of it. Thankfully I was able to find it on youtube and was able to get it off. The new head fit on really easily. The only negative thing that I didnt like was the fact that they didnt/dont send any nuts to secure this. You are supposed to supply your own nut. But because its a reverse threaded bolt on the trimmer, youd have to get the right size, thread pitch and reverse threaded nut. I figured itd be easier for a company to throw a mix of the most common used sizes and thread pitch/count, reverse nuts than it would be for the end user to find one. Thankfully, the end piece that goes on my trimmer used a removable nut, so I was able to take that out and use that. Not sure if other string trimmer brands are like this tho.

James Baker