Quoted from pinballinreno:
In regards to the pop-up mechs rubbing on the wood:
I loosened the nuts on 2 of my mechs and twisted them around as much as possible to get them lined up.
The mechs are a little sloppy and loose internally so what works at level with the playfield in its service position might change a bit at 7 degrees.
They can also be "bent" or even squeezed a tiny bit to get them to just barely miss the wood. All they have to do is not rub at all when at an angle.
If they rub even the slightest amount it causes them to pop up and then go down as though they have been hit with the ball.
In fact, yesterday put two thin small washers on the two front most (closest to player) screw mounts, between the mech and the wood which really got a lot of consistency for my goblin.
I agree that the mechs need to be tweaked ever so slightly sometimes. Very doable. Very easy.