Re: am i doing it right?
If your chain tightens and loosens dramaticly when the wheel is turned, your sprocket is too far off center.
Once the doughnuts are tightened to the spokes, it's nearly impossible to loosen the joint and move the sprocket to a slightly different positon, unless you reverse sides of the doughnts.
They tend to fall into the old spoke impressions and want to find the original poisiton.
Hey, chinese chain and sprockets have a large variance in accuracy.
You might be O K by just finding the tightest spot in the chain, and adjusting for just a little slack there.