You are suppose to spin the wheel while tightening the bearing until the wheel starts to slow down and drag, then you back the nut off again until it's loose. Not loose enough that you can feel play in the tire, but loose enough that the tire spins freely. I er on the side of too tight rather than too loose and haven't had issues. If you have calipers measure the spindle, it's it's worn (from bad bearings) you'll never get it set right.