Claw machine tilt adjustment broken

[toozie21]

I recently bought a used claw machine for the kids to play with in the garage.

It was working fine, but the claw was descending much too much before closing, so I decided to adjust the tilt screw that is in the housing that controls the claw. When I put My screwdriver through the hole, I felt whatever the screw was in move forward. I took off the side wall of the box and finished making the adjustment. Now whenever the claw descends, it goes a few inches, closes, and comes back up. I don't know anything about claw machines, but it really feels like something got messed up that senses the string slack with that micro switch. Is something supposed to go on this little round knob that looks like it has grooves etched into it? I'm wondering if something popped off that's causing me my issues.

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