They are N/C on Jet Spin, my door switch was so touchy I clipped them together.

Slam Switch (resized).jpg

After looking at the schematic, the tilt hold relay is in line with the dreaded Gottlieb AX relay, I would start there and make sure it's adjusted perfectly.

It's N/C. hence the clip I installed there also. It didn't take much to open any one of these tilt switches and there goes your great game.

Ball tilt (resized).jpg

BTW. My plumb bob is still active.

They are a normally closed switch. No gap. I could have adjusted the switches to apply more closed force but the clips are a easy way out.