Retro 7 hole on back of frame?

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  • FrankW
    Balls
    • Jul 2020
    • 108

    #1

    Retro 7 hole on back of frame?

    Anyone know what this dirty hole is for?
    Click image for larger version

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  • BrickHaus
    Tactical Spoon Reacquired
    • Sep 2020
    • 3396
    • Minnesota

    #2
    Its most likely the entrance hole they had to bore for the air through passage. Then they typically just tap it and plug with a red loctited set screw.
    https://www.mcarterbrown.com/forum/b...khaus-feedback

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    • FrankW
      FrankW commented
      Editing a comment
      Thanks!
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