One of the steel brake lines corroded enough that it started to leak. So I need to replace a section of the line. Somehow it is something that I have never had to do before and do not have the tools. But I looked on the internet and found descriptions of how to do it and lots of discussion on RCM on problems one can have.
But what I did not find was anything about how to make the adapter used to make double flares. Have a lathe, should be trivial to make the double flare adapter.
In searching I found the Lisle sells the adapters. Naturally none of the autoparts stores carries the Lisle 31370 part, but found a bunch of mail order places that do carry it. Most of them sell the part at discount, but with a big shipping charge. The best total cost I found was Auto Parts 123 selling through Amazon. $2.18 for the part, and $5.23 for the shipping. Note this only is worthwhile if you already have a tool for single flares. After I get the part, I will try to post something so that others can make their own.