A splice by inner sleeve requires an inner tube with an OD just under
the ID of the original tubing.

I've been splitting the tube, removing a 5/16 lengthwise piece and
then squeezing the tubing in a vice, trying to keep it round. I'm
running a bead along the seam, then grinding it down. Finally, I chuck
it in my drillpress and file to fit.

Is there an easier /smarter way to do this? - MikeH