Question about Iron Maiden (Pro).
In the back loop, between the two up-posts, there's these problems, causing a ball trap back there, which gets the ball stuck:
1) The back loop is gently curved at its peak, instead of having a sharp point. So, that creates a flat area for the ball to become stuck at, because gravity won't be much of a help anymore, as the ball is happily resting against a level surface, with no incentive to roll downward.
2) The back loop is also the landing area for balls that are shot at the bullseye (like Lord of the Rings). So, the playfield back there quickly gets pockmarked with little craters, which create friction.
3) The back loop contains some Mylar, in an effort to protect from the above, but that isn't sufficient. The Mylar itself gets crinkled, and is lifting up and crumpling in some places, creating even more friction.
So, all these stack together, creating a situation in which the ball often gets stuck back there. The player has to shake the game pretty hard to get the ball out, sometimes resulting in a tilt.
Are there any known workarounds?
Here's two ideas from brainstorming:
1) Cut some stiff clear plastic and put it on the playfield back there, which would create a smoother and stronger surface. The disadvantage would be that it would create an edge versus the rest of the playfield, possibly causing another ball trap.
2) Bend the metal ball guide that's the front edge of the back loop, in an effort to prevent the ball from coming to a rest there. The disadvantage would be that it would make the loop narrower, possibly causing the ball to become stuck, and it wouldn't really solve the problem of the surface becoming pockmarked.