Quoted from jackd104:I'm working on improving the ball shooter, it's been rattle-y since I got the game a couple weeks ago and it really bothers me. This builds on prior threads by fooflighter:
https://pinside.com/pinball/forum/topic/stern-godzilla-official-owners-club/page/280#post-7087445
https://pinside.com/pinball/forum/topic/stern-godzilla-official-owners-club/page/281#post-7088176
I've done several things from this advice, will share to help others, but also to get pointers moving forward. I have made progress: it shoots much better now, but is still not to my satisfaction.
The first step was stabilizing my playfield, as it would shift by 3-4mm if I pulled on the front of the PF left/right. If that isn't stable, then aligning the shooter rod won't do much good.
There was prior discussion about playfield alignment brackets and that some earlier GZ's had come with them, but newer builds didn't. I emailed Stern support asking why my GZ didn't have them, while others did, and if it needed them. The response: "As for the alignment bracket, the new cabinets are not supposed to need them. I forget the exact date we started using them, do you know when your friend got their game?" Apparently, there were "new cabinets" at some point, and it was on purpose the brackets aren't installed any more.
Although Stern said the new cabinets don't need them, my playfield (build date 8/22) certainly seemed to need them (btw, another owner in this thread said their PF didn't move at all, and they didn't have the brackets - puzzle). So I ordered the brackets:
https://www.pinballlife.com/switch-plate-left.html
https://www.pinballlife.com/switch-plate-right.html
(note, when this part is being used as a playfield alignment bracket, it really shouldn't matter whether you use the "left" or "right" part, but anyway...)
To install these brackets...
With the PF down, I reached my hand through the coin box with a small piece of painters tape and stuck it by feel to where the PF meets the cabinet. This helped determine where to put the brackets.
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On each side, I screwed in the brackets so that the top screw was right near the top of the tape. Just used one screw at first in case it was in the wrong position (why make two bad holes instead of just one?)
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I lowered the PF to test them out. They were in the right spots, but the PF wouldn't lower all the way. So the brackets needed to be flattened a little. I thought about tapping them with a hammer, but didn't wand to damage the cab, so I removed the brackets and flattened each slightly in a vice. Pic shows before and after slight flattening.
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Then I removed the painters tape and put the brackets back and tried again. PF was snug and fit was good. I added the second screw to each bracket. And it looks like this installed.
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Now, the result of this was that my PF was rock solid. I could not budge it even 1 mm left or right when pulling on the front of the PF. A nice feeling in itself
With the PF stabilized, here is what my shooter alignment looked like - too far to the right. Also, quite far away from where the ball will rest.
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Next I loosen the screws on the shooter rod housing and shift it over to the left as far as I could. It barely moved so I just moved it as far as possible and hoped it was far enough.
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I could have done a few different things to bring the shooter tip closer to the ball. I had several old barrel springs so I decided to try a shorter barrel spring. (this part may be similar to one I used, but it's hard to tell from the pic: https://www.marcospecialties.com/pinball-parts/25878)
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(I'm not thrilled having this nasty old spring on my beautiful GZ, but alas...)
So this is how the alignment and position looks now when at rest. Well-aligned and the shooter tip is just a hair from the ball, which seems to work well on other games:
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The result... overall, the shooting experience is much improved. Before, nearly every manual plunge was a rattle-y shot that didn't cleanly leave the shooter lane. Now, soft plunges and powerful plunges are nearly 100% clean. There is a lot more trouble in medium-strength plunges, though. Somewhere around where you want to be to hit the skill shot. And with those, it's about 50/50 a clean shot verses rattling around.
To me, the effort thus far was worth this result, but still puzzling whether I can actually make it better from here. With some slo mo video of the medium-strength rattle-ly shots, things always go wrong at the short metal ramp near the shooter.
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Before hitting this ramp, the ball is going straight. Then, near the top of this ramp, the ball veers toward the right, hitting the right wall, bouncing toward the left and hitting the metal wall near the scoop.
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Right now, I am feeling like this metal ramp may be a design problem that I can't reasonably fix. Other games have a slit or graduated channel for the ball which seems work better. When the ball hits that ramp, there's a sudden change in upward direction that causes the ball to go wonky about half the time. At least that's my theory!
If anyone else tries to improve this or has suggestions I am all ears. Also, does anyone's GZ actually shoot great out of the box? I would be curious to know.
PS - game is carefully leveled side-to-side with digital level, and at 6.65 slope. Many have said 6.8 ish is a better slope for GZ and I'll try that sometime soon. Not sure if that will affect this issue any though.