Hmmmm. The wheels in my head are spinning again

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You really don't need any press fit. When you peen the tube it will never get out.


Some guys said they had an issue with the tube trying to turn when they use the peening tool. Mine have never been anywhere near loose enough to do that but like I said I don’t have a hone. It looks like the copper tubing is around .035-.038 thick. (1/2 inch house tubing) 5/8 outside diameter