On Sun, 15 Apr 2018 15:17:46 -0700 (PDT), TimR
wrote:

I don't want to shorten the tubing, as it's the right length now, or I would just cut each
end and start over. I could do that and insert a piece, but I would have to buy a 100 foot roll.

Go to a local plumber and ask to buy a few feet. Splice as needed.....

Or buy the 100ft roll and sell what is left on ebay or craigslist.