(Topic ID: 271313)

Gottlieb: Lock-Tite on flipper screws?

By goldenboy232

1 year ago



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  • 10 posts
  • 7 Pinsiders participating
  • Latest reply 1 year ago by KenLayton
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#1 1 year ago

On the Gottlieb Flipper Mechs they went to on some of the later games (ex: 1977 Big Hit, 1977 Jacks Open, etc.) it's well-known that the set screws that hold the flipper shaft to the mechanism that turns can often be stuck in the hole and brittle.

I have been having problems lately where, although I'm able to get those screws back out, once I put them back together and in the holes, they start to back out a little bit and then the flipper shaft doesn't turn when the mechanism turns.

I am not sure if this is because:

A. I'm not tightening them enough (perhaps because I fear them breaking off, as they're known to do
B. Somehow the holes have just been warbled out slightly larger through the years and they're not in those threaded holes tightly.

I am wondering if the community has had experience with this and found a good solution. I was thinking of taking them out, applying some Lock-Tite or another product to the screws, and then putting them back into the holes tightly.

Thoughts?

#2 1 year ago

If you use Lock-Tite be sure to use blue, not red.

#3 1 year ago

When this happens I find I need to tighten just a bit more but I agree it can be agonising.

#4 1 year ago

Most all flippers that I disassemble appear to have some thread locking compound on them. Can probably solve your problem using Loctite Threadlocker Blue 242. It is designed for the locking and sealing of threaded fasteners which require normal disassembly with standard hand tools.

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#5 1 year ago

LOCTITE® Green Threadlocker is recommended for locking preassembled fasteners, e.g. electrical connectors and set screws. The product is categorized as medium-to-high-strength for wicking. It is also available in a liquid form, cures in 24 hours and can be removed with heat and hand tools.

I think you should use "Green". It says green is recommended for "set screws" in the description from lOCTITE above. This is just my opinion. If the green doesn't work out you can always move up to the blue.

#6 1 year ago
Quoted from JethroP:

Most all flippers that I disassemble appear to have some thread locking compound on them. Can probably solve your problem using Loctite Threadlocker Blue 242. It is designed for the locking and sealing of threaded fasteners which require normal disassembly with standard hand tools.
[quoted image]

That's what I use for flipper set screws. Works very well and you can disassemble the flippers when needed without any problems.

#7 1 year ago

Ok thanks guys! I'm headed to Home Depot this morning for a few things and will pick some up. Appreciate it as always!

#8 1 year ago

Replace the set screws. I hate the set screws that go into the pawl and you have to use an Allen wrench on them.

It can also be hard to get them tightened well when the shaft of the flipper is scored up.

I have never used any kind of thread lock compound on a flipper and don't have issues with them getting loose. Guess I've just been lucky.

#9 1 year ago
Quoted from EMsInKC:

Replace the set screws. I hate the set screws that go into the pawl and you have to use an Allen wrench on them.
It can also be hard to get them tightened well when the shaft of the flipper is scored up.
I have never used any kind of thread lock compound on a flipper and don't have issues with them getting loose. Guess I've just been lucky.

Yes this is what I normally do, but even then I've had two different games recently where after a month or so of playing one of the screws will loosen up enough that the flipper doesn't turn. Anyway, good to have options.

#10 1 year ago

It helps to use fresh set screws too.

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