Re: removing flame arrestor or filler screen
There are only three threads on the collar so if you were able to turn it that many times you would be free of the threaded portion.
Perhaps the screen is bent or distorted so that it is unwilling to exit the hole.
I'd try vice grips on the screen collar and you may be able to coax it out.
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Early '29 CCPU that had a 4-speed, but not any more.......in the family since '62
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