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Thread: Black insulator on restrictor plate class

  1. #1
    Join Date
    Jan 2016
    Posts
    17

    Black insulator on restrictor plate class

    What does the rule book say about the black insulator on restrictor plate motors and non restrictor plate motors

  2. #2
    Join Date
    Oct 2013
    Location
    Concord NC
    Posts
    1,813
    Minimum thickness,, no rifleing,,angleing,dimpleing.. Basically a straight enlarging of the hole is allowed..
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