Pretty simple I bought a used Husqverna ...CHEAP, started going through it gonna give to son-in-law, found out it is a MIX of years and parts from everything under the sun and most all wore out, no problemso Im replacing bushings and run into the from axle 2 bushings no big deal, pulled the bolt that holds it expecting a lot of wear and there is none. the bolt is a cap head 7/16 but the shaft on it is smaller in diameter that the thread, thats whats causing the back and forth on the axle- has to be the wrong bolt- anyone??? Should these have a thicker shoulder on the bolt that the thread?