So I was leveling some dirt with my rear blade when suddenly the blade was only lifting on one side? When I went bak to see what was happening one of the lift arms had come off the spindle! The one side still had the washer on it but the other was gone. So I got a new one and slid the arm on but it doesnt seem to go on far enough because when I put the washer back on and strted to use it, the washer slid off again. Im speakingbof the two upper arms just under the seat that lift the imatch hitch. Any thoughts???