See https://pinside.com/pinball/forum/topic/avengers-definitive-tweak-guide/page/2#post-2511946

This is a common problem... Check with Stern, they may send you a replacement plastic for free.

Mac

If anyone wants to make the plastic "Hulk Proof" , here is how I did it:

1. Get some stiff paper to use as a template. I used a piece of the red rosin paper that you can get at Menards in the paint section.
2. Trace the outline of the two plastic pieces that go on either side of the right bridge support arm.

Note: you will be putting the single piece of metal under BOTH pieces... not because the right one will break, but because you need someplace to anchor the metal to so that it is sturdy when Hulk hits the piece on the other side.

3. Cut out your paper template.
4. Remove the two plastic pieces.
5. Fit the template and mark the paper for holes where the screws hold the plastics on.
6. Take the spikes off of the left plastic.
7. Lay the left plastic on your template and mark the holes for the spikes.
8. Double check the template shape.

Take your template to your local home store and find a piece of thin galvanized steel just big enough. I used a building corner bracket piece that I found in the lumber section. You want it stiff but thin.

9. Cut the metal using the template. On the side where Hulk may hit, leave an extra 3/16 of an inch of metal that you can bend up with some pliers. This will give that edge extra stiffness and protect the edge of your plastic.
10. Drill holes where needed.
11. Sandwich the metal under your plastics, and re-install the spikes.
12. Drop the reinforced unit in place and secure with the original plastics screws.

There are no lamps under these plastics, so the metal blocking light from below does not come into play.

Enjoy many years of Hulk multi-ball with no worries about this plastic breaking again

You might consider using just one metal protector under your plastic instead of using plastic... it is the Hulk you are battling after all. See my post on how to make one.

Mac