The blades on my ceiling fan were loose. When I tightened them, the fan would not turn. I tried loosening them again to their previous position, but no luck. When I remove the blades, the assemble runs at full speed. When the blades are reattached, it does not run or runs very slowly. I have tried switching the blade position, trying weight distribution (taping quarters to blades), and nothing is working. What went wrong?