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Lloyd E. Sponenburgh[_3_]

fired this volley in
:

I will remember the mandrel trick for next time it matters.

If one has a slitting saw and some time, you can make an "Expandrel" that
will fit tight in any size pipe you want to name, and can be CUT INTO in
order to part rings or to o.d.-surface thinwall tubing. I've seen
versions that will clamp to the outside of a tube to allow i.d.
finishing... but those are a bit of work to make (clinching rings, and
all that).

It depends on the value of the job. An hour or two making a disposable
fixture might be worth the time.

Lloyd