Review on Stainless Steel Fidget Block With Sprocket Gears And Bike Chain Linkage - Kinetic Desk Toy To Improve Focus, Meditation, And Help Break Bad Habits - Perfect For ADHD - Silver by Christina Ford

This is my 2nd fidget and probably the best. It is for people that need something complicated to help them think. Especially if you smoke a pipe, cigar or like coffee. It's the spinner for you. Five star *****, but I do have complaints.CONS;It's tiny, that's good and bad. I expected it to be a bit larger.It's well machined, and the main frame peace that holds it together is very sharp, knife Sharp to be exact. Solution, it's worth it to take it apart and apply some sandpaper around the outer edge the elliptical oblong frame holding peace. Do not sand either of the Precision cut holes where the bearings go through.PROS;The chain has no sharp edges.It's ball bearing, plus brass bushing. Spins nicely.Comes fully assembled, but you do need to sand the sharp edge holding piece as described above. Careful attention should be given in exact component placement and facing as originally assembled. While you cannot tell any differences between some of the pieces, they don't always fit together the same way. And when tightening them down things that didn't bind before, may bind when reassembled. If you have retained the exact reassembly placement (I suggest to draw diagrams and separate parts if necessary) of the original components and facing and you see binding. I suggest, that you back off slightly all of the screws and wiggle everything while tightening gradually in small steps, so that everything seats properly.Everything should be quite loose when properly assembled. Do not force anything, and tighten to within reason. Note, allen wrenches provided are low quality and can damage screw heads. Special note, the washer above the holding plate should bind to the brass bushing and it's screw, but this binding washer should still turn but with resistance when holding the allen wrench. This is how to tell if you got it correctly assembled. The washers on the exposed sprocket side should be completely sloppily loose and wobble about. That's how you know if you got it put back together correctly.It is employing 2 bearings for maximum speed. The ball bearing, and the brass bushing. Both sprockets are honed internally to Glide and wobble on the brass bushing. This is done so that the teeth of the sprocket can stay aligned to a spinning chain. Incredible ingenuity yet simplistic. Again, *****. WORTH The Money $24.99, But buy only Stainless Steel as Colors or Gold rubs off and looks bad.