Have a fleet of nine toro 21"s. It seems that after about 200 hours of use the front wheels get loose and move up and down when raising the front to make turns. I assume the only solution is tightening the bolt after you take the wheel off. BUT.....it is almost impossible to keep the socket wrench on the bolt, as you have to put LOTS of pressure on them to get them to tighten. This results in busted knuckles.... Is there a better way? Any way to prevent this???