(Topic ID: 29731)

Vid's GUIDE To Rebuilding Pop Bumpers

By vid1900

11 years ago


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  • Latest reply 7 months ago by Zitt
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    Topic index (key posts)

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    Post #183 Bally 80’s pop bumper rebuild Posted by vid1900 (9 years ago)

    Post #407 Recommendation for stapler Posted by vid1900 (7 years ago)

    Post #536 Link to a great video for people who are new to pop bumpers. Posted by Axl (5 years ago)


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    #454 6 years ago

    I got a question rebuilding one of the three pop bumpers in my WCS94.

    Once I got the new ring assembly shafts thru the metal and fiber yokes and secured both nuts, it appears shorter than the other two pop bumper shafts in the pin. (see pics)

    I read somewhere they make this same ring w/ 1/16" shorter shafts and I think I got one of those rings.

    Question is what happens if I try to use pin w/ shorter ring shafts?

    I'm not planning to, I'm getting the correct longer shaft ring, but was curious why there are two rings with such a miniscule length difference? Is one for Data East or Gottlieb?

    shortshaft (resized).jpgshortshaft (resized).jpg

    longshaft (resized).jpglongshaft (resized).jpg

    #458 6 years ago
    Quoted from vid1900:

    Get a ruler out and measure those rings.
    Is it just that one set has more thread, or it is actually longer?

    Here's a pic of the broken ring that came out of WCS94.It measures 2-1/2 inches from the top of the ferrule to the start of the threads.
    Add 1/8" for the ferrule height to where it attaches to the ring, so 2-5/8" to the beginning of the threads.

    Not sure how long the threads were on the one I put in the pin already. I don't have another ring out of the game or a spare.

    Could you measure one and let me know if this length matches what a Bally/Williams should be?

    BTW, never did find the two lock nuts in the cabinet with the threaded rod portions in them but I did find the two washers.
    Might have been like this for years and the only way I noticed any issue was the switch error (credit dot) I got and found the broken metal yoke.
    Those threads are smoothed out and gone on the broken shafts.

    pbrbroke (resized).jpgpbrbroke (resized).jpg

    #459 6 years ago

    Could someone please measure the length from the bottom of the threads to the ring and/or ferrule for me?
    Thanks.

    #461 6 years ago
    Quoted from ajfclark:

    Williams A-4754 I have here is just under 1/2" of thread. 2 1/2" from the threads to the shoulder. 1/8" shoulder to the ring.

    Thank you for confirming...I couldn't find dimensions for this part online.
    BTW, how long is the threaded portion? Mine had snapped off.

    3 weeks later
    #466 6 years ago
    Quoted from La_Porta:

    Just as I looked over your guide, here’s what I found when pulling apart my first pop for playfield swap. Good thing I had extras!

    Hey! That looks somewhat familar...

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