what diameter is the spindle and how far into the bumper does it go? It should go thru the bottom so it can be welded at the bottom and top of the tube(bumper tube); might give the spindle a tiny preload. the one I like is 1 1/2" diameter...next, the bushing should almost have to be reamed to fit the spindle( very tight and square bore). the longer the sleeve and overall length from outside to outside of flange of the bushings should be as long as possible w/o cutting into function and looks to help minimize any play, and some delron ramps/shims/stops should be used to support the end of the arm when it is closed, AND a clamp type of latch to pull the whole thing down onto and into the stop...of course, all this is contingent upon how sturdy the bumper is and how well it is secured to the frame...