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Colin,
I suggest you use only a double lap flair.  A special tool is needed to make
this type end but it is well worth it.  Aircraft Spruce sells it.  I have
had not one leak or problem with my flairs to date.
I have had my A&P for thirty plus years, tho...
As for hardness of the lines, Lancair supplies tubing in the -0 condition or
fully annealed.  It is possible to make a single lap flair on T-3 tubing but
it cracks easily.  The soft tubing is fine for our 1200psi pressures.  Do
not overtighten the B-nut!
Walter Dodson  IV-P  60%

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LML website:   http://www.olsusa.com/mkaye/maillist.html
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Please send your photos and drawings to marvkaye@olsusa.com.
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