The mech that kicks the ball into the plunger lane is very very weak on my POTO, so weak that it can't kick the ball all the way out. I checked the coil/coil sleeve, and everything was good there. The problem is that the mechanism moves VERY slowly. I took it apart, and there definitely is some resistance in the actual kicking arm when I try to move it manually. It looks like there once was some lubrication on the pivot part. This game hasn't had any attention in a looong time so it would make sense for the old lubrication to be rotten. I know in general lubrication is a big pinball no-no, so with this part should I just clean off the old lubrication and put it back together, or clean it off and add some new wd-40 etc.?

Thanks for your help!