Quoted from GRUMPY:The upper score contact is on the wrong side of the pop yoke. You are not forcing the contacts together so in a short time they will be acting up again. You need to press them closed plus a little more for a wiping action to keep the contacts clean.
I thought that too. I know pop bumper switches on earlier games were set up differently. If you look at the manual images (Planetary Pinball Site) for that era. Then what Ryan has looks appropriate for DC bumpers.