Quoted from aobrien5:
Can you explain to me why my game doesn't work right without them, then? (Or with them, for that matter)
With caps, along machine guns, but I get sound and mode switch with every hit.
Without caps, sling does not machine gun and I miss about 25% of sounds and mode swaps.
I wish i could.
However, let's go over the basics:
What shape are the slingshot switches in? Do they have gold-flashed contacts? Have you cleaned them, and if so how did you?
Are the contacts on the slingshot switches installed correctly? All 3 classic Stern's i own had one of the contacts incorrectly installed on the slingshot switches--all 4 switches on each game had one contact that was installed backwards. By that i mean the face of one contact was facing the tiny nub (the back) of the other contact. Can you take a couple close-ups of your slingshot switches? I'm thinking that might be your issue.
Edit: i found the overhead pic of the switches above, looks like the contacts are facing correctly. But to be sure, op, please post pics of both pairs of switches.
Another thought too: is there any switches underneath the playfield that are part of the slingshot assembly? I know I've seen games that will have a switch that actuates from the motion of the slingshot plunger moving into the coil. Like, the upright switches poking up through the playfield will activate the slingshot, but a separate switch under the pf will handle the scoring. It's a shot in the dark, but figured I'd ask.