Originally Posted by TheC-Master
My blades tighten a lot when I want to sharpen them, crazy amounts. I don't know if it does it from the spinning, or if it's the shop when they do it. One time I opted to do it later as it wasn't dull and it was super tight when the shop hadn't touched it.
That is because you hit something that jammed the blade(s) (object tryed to stop the blade) and the nut got tighter.