I had a red band 2 speed hub I rebuilt and laced into a wheel. it brakes well and shifts well but every once in a while it feels and sounds like the chain is out of line or too tight (kind of a rough feel at the pedals) but if i shift it that goes away. Also sometimes the cranks will go about half a turn when i go into low gear instead of engaging after about a quarter crank or so. what should i check? when I checked it before I laced it the index spring looked like it was working well and aligning right with the slots. I know parts are few and far between so hopefully its something that can be fixed instead of needing replacement