3/4-inch copper tube is commonly used in USA for carrying water in buildings and homes. Cheap and plentiful.

I have a non-plumbing application where I need to expand a few inches of one end of a length of tubing.

Nominal 3/4 inch size tubing is 0.785-inch I.D. I need to expand this just a hare to 0.787.

The I.D. needs to be expanded evenly to accept a cylindrical 20mm slug (which measures 0.787). How to accomplish this? I don't want to drill this out as I want to maintain the wall strength. The "slug" is precision, and needs to be a slip-fit so can't just hammer it in.

Any suggestions welcome.

Thanks.


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