Hope this helps from Super Spin owners manual(2player version of jet spin).for educational purpose only...IMG_20221230_052600 (resized).jpg

They don't need to be welded, but by being soldered together the switch won't activate the tilt. Those are slam tilts for people who are drunk at a bar. The plumb bob is what you want working for home use.

Shouldn't those slam tilts and tilt switches be N/O? soldered together like that wouldn't that keep it permanently tilted?
I could have that backwards, but I don't think that's right...

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.

on the tilt board they are normally open... where's the tilt ball?

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.

On those N/C switches you could just adjust the gap wider so they don't need to be clipped like that...
But at home if you don't abuse the game the tilt bob is all you really need and you can adjust to your liking for that one.
Nobody's slam tilting at my house or they will be introduced to the door and a size 13 boot!

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.

Doh! N/C = no gap. Ooops I seem to get confused sometimes!

And pretty sensitive, Im not playing your game...