There is no way I can put the spacers on after the sprocket ... they won't go over the key. I did manage to get the key out and removed three spacers then put the sprocket back on the other way. The key isn't down far enough on the shaft to put spacers on after the sprocket. The key won't slide at all. I lost one of the side screws. I was putting it in ... at least that what I thought, I had it on the allen wrench started to screw it in then I notice the screw was no longer there. I can't find it. It must be stuck on the bike somewhere. It is extremely small. After I put it back together, it was knocking at first then I reduced the tension that stopped the knocking, and now it seem to be in alignment. No knocking or binding now.