[FC] brake lines

[Timothy T Werner]

I have a question on flaring brake lines. I have a new flaring tool, and
it has the parts needed to make single and double flares on brake lines.
I have made some practice flares but while the thing makes a nice single
flare, I cannot seem to figure out how to make the double flare part. No
instructions came with the tool. Anyone successful at this or know of  a
web site or book would be helpful.
Tim