Review on High-Performance SHIMANO Tourney 7/8-Speed Rear Derailleur for Mountain Bikes - RD-TX800-L (Black) by Dave Hock

I was able to install this in about 5 minutes. It was super easy. However, it didn't include instructions on how to adjust the bolts to get the chain moving properly. The tiny guide is designed to scan a QR code for a manual. I have made. And the instructions were almost the same as the ones in the box. he had no setup instructions. And what sets this switch apart from others I'm used to is that it had 3 adjustment screws versus the 2 most others I've seen have. So now I'm not sure. I think I'll have to take the bike to PRO to set it up properly because in a few hours. and a whole lot of googling and youtube. it still doesn't shift properly. So I need a professional to make adjustments. Otherwise, I am very satisfied.