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the ID is about 7mm. Your tool idea is exactly what I was thinking about. The ZipDee maintenance folks said the crimps could be undone using a flat blade screw driver and vise grips.
I'm thinking a long taper rod (like a bullet) that is a slight under size, a flat piece of steel that fits in the slot and can be used to coax the rod along, and a body hammer to tap the aluminum against the rod to bring it back into round.
I tried prying the crimp out with a screw driver today and it's not very effective and has a lot of potential to make things worse.
Zep
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