Quoted from DiabloRush:The quest to improve TK lock consistency continues. Next on the list was removing play from the main pivot for the moving ramp. This is secured with a large e-clip, and access and upgrade is surprisingly simple. No other disassembly required. Details follow.
Put the playfield on a set of jacks to make access easy. The main pivot has considerable slop, something you can easily verify on inspection. You can get at the main pivot and the e-clip from either the side or back. I used a screwdriver to remove the clip. There’s a single washer holding the top of the cam plate. First pic shows OEM washer (middle) and the upgrade washer (right). The OEM washer is about 55 mils thick. Center hole is 1/2”. I had plenty of washer with this same size, and found one a bit thicker, around 90 mils. Substituted this washer, replaced the e-clip, and verified I still had a smoothly functioning cam plate and pivot. See pics, below. This removed almost all the slop.
This mod combined with a thicker washer on the stepped-bolt on the other side of the cam plate has removed nearly all slop from this assembly. You still need to align this by the methods stated in the sticky threads, and when all was done, I now have a very smoothly functionning TK lock. No rejects on good ramp shots now. Hopefully, this holds up in the long term.
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DiabloRush Your two posts regarding this need to be stickied! Posts 21541 and 21552
I was inspired by this post and applied this same fix to an original run LE that I have been doing a shop job on for a local operator. I am now at >95% lock rate and the mech just feels so much better! Even on a deep game nearly an hour long with no flipper fans, I was still consistently locking balls. I had attempted all the documented adjustments before this and never had consistent success.
The main pivot washer is the primary culprit in the mech sloppiness. I replaced the washer with a larger one, just like DiabloRush did.
I only had a few on hand, so I had to file/sand it down in order to not bind up the mech. The final measurement I got was a 2.35 mm thick washer. The original washer combo was about 1.95 mm. I also replaced the secondary pivot washer with a slightly thicker one. I didn't measure this one as it seems to have more give due to the locknut on the bottom. I had the left ramp removed anyway for a teardown, so it made the job super easy.
This allows just enough play in the mech to function, but eliminates any extra movement.
I then followed the stern adjustment procedure that has been out forever.
https://pinside.com/pinball/forum/topic/stranger-things-club-join-our-party/page/35#post-5472488
If you haven't done this to your game yet, you should give it a shot! Now if we could only find a source for the exact washer size so we can get these distributed to all prem/le owners. I also wonder if the new run mechs are as sloppy as the original. I'm sure they could be improved too.
The fact that Stern couldn't figure this out by just putting the correct freaking washer size in is really mind blowing.