Review on L Faster Electric Conversion Customized Derailleur（Twist by Esvin Hopuhnopuhlis

It says "universal fit" and doesn't even come close to matching any of my 6 bikes. You have to drill holes and make big changes. Furthermore, the quality of this kit is absolutely deplorable. As you can see from the photos, the screws that hold the sprocket are so soft that they break off before it's even tightened, as in the picture. I'm a retired machinist and haven't disassembled them, they understand themselves. Then, before I even started fitting the kit, I gratefully took the advice (the only thing that makes sense in that ridiculous video they call instructions ) and tested it. You guessed it, it didn't work. I'm sending this junk back. Don't waste your money guys. This is the worst quality set I have ever seen. It is of such poor quality that the pad is missing a hole behind the spokes. Get ready for a lot of work installing this kit and providing bolts, nuts, washers, etc.