There are no complaints about the product itself, although some "engineered" solutions are surprising, for example, the clamping nut of the eccentric at the landing site of the angle grinder is turned the other way around, and if it is deployed correctly, the clamp does not tighten, because the thread was not screwed up (photo 1.2), it is also not clear why a tensioner spring is needed if the roller is fastened tightly with an eccentric and the spring cannot tension anything, but stupidly rests on the nut on one side and on the bolt on the other (photo 3). The ribbons that come with the kit are terrible, they may have crumbled during delivery, but this also indicates poor quality of the ribbons.