Quoted from Ockeyhead:
Had the same issue w/ the gradual sluggishness w/ the truck. When the machine was new the truck was fluent w/ movement, but there was a gradual decline within the past month. I also disassembled the truck w/ the set screw & while I was underneath the playfield I cleaned the inside bushing w/ isopropyl alcohol. There was a buildup of grime within the bushing as now it's squeaky clean. This & adding silicone oil to the bearings has rendered the truck swing sensitively responsive w/ perfect play.
My only concern is while underneath the playfield, there were several post that were loose & also the pinball attachment connected to the truck has some wiggle, left to right, etc. I believe this attachment should be secure & flush without movement?[quoted image]
I thought so as well about the attatched ball. However, if you look closely, the nylock nut can only thread down so far. Then, the rest of the "tightening tension" is provided via resistance from the rubber rings....lol. SO, the only way I know of to get that ball stiffer, is to maybe add an additional rubber ring on the shaft, and squish the hell out of them.