i took a square and put held it on the rear triangle of the bicycle an adjusted it so it just barely touched the sprocket and spun the wheel slowly tightning the bolts to keep it all the same. so not to much wabble. i also put the square so it just barly touched the the teeth on the sprocket again i spun the whell to make sure all was square. you will never get it perfect unless really lucky but that will make it close at least. hope that made sense
