Hi, everyone! I am currently working with a group to make an educational model of how a pop bumper works. We are using pop bumpers from a Williams Pit Stop that we bought on eBay. They work fine and have been cleaned, but when we have them attached to our wooden 'playfield' (a plain piece of plywood) and roll a ball towards them, they don't kick it out nearly as powerfully as expected.
We thought that perhaps there wasn't enough clearance between the metal ring that gets pulled down by the plunger and the playfield surface to let the ball travel further towards the center before triggering the switch - in that case, we figured maybe we needed to carve out an inlay on the top surface for the weirdly-shaped plastic piece, but the pop bumper rebuild guide here:
does not seem to have such inlays (see picture 11.jpg).
So, at this point, I'm not really sure what could be done to improve its performance. Any recommendations?
Thank you in advance for your help!