[Fot] Source needed for single-flare brake lines

[Fubog1 at aol.com]

OK all, I have this here crow in my hand & I'm fixing to bite his head  of 
iff'n I have to...
 
Reference DOT FAA "Aircraft Inspection & Repair", calls out double  flare 37 
degree on soft material, single flare on hard.
Carroll Smith takes it a step further on page #207 in "screw to win" &  
places people like me under the "fool" category... (I've been told that before)  & 
advises NOT to use the AN818/9 to adapt 45 JIC to 37 AN, but this is  
referring to a SINGLE flare end. I would suggest that the double flare, due to  the 
extra thickness, likely allows more deformation so as to provide a  leakproof 
seal? Also I consider automotive grade bundy tube to be fairly "soft"  until it 
is work hardened. 
When I spoke with Pegasus tech today, I was very clear with my question  & 
the reply was that this is completely acceptable. Those who know me know  that I 
try to do my best & I truly have not had problems using this  method for many 
years, but I'll admit that just because something works doesn't  necessarily 
mean that it's "right".
Does anybody else do this?
All input is appreciated,
Glen