I found some divergent information.
On another post, one where a gent built a DIY version of the Loricraft
http://www.canuckaudiomart.com/forum/viewtopic.php?f=32&t=12254 he advised type "A" equaled the 30 gauge specified on SmartDevices website.
Thus, I wonder if Size D @ .0104 as specified above, or Size "A" @ .006 is the correct diameter?
In this same thread, a poster advised the length available at SmartDevices was 1000 feet. I wonder if that is indeed the length available? If so, in perusing the spools available at Gudebrod, the only one to approximately equal 1000 yards is: "NCP® (nylon) 300 Yds." rather than the non NCP nylon thread.
Apparently the difference between NCP and non-NCP is: that "the color pigment in NCP® is preconditioned into a colorfast medium that resists the damaging effects of powerful epoxies and varnishes that break down the color pigment in regular Nylon thread".
Of course, it's possible that SmartDevices is buying in bulk (2K to approx. 5K feet spools are available) and is winding their own spools, to equal the 1,000 yards, but somehow, I doubt that is the case.
So I guess the questions are: should one use NCP or non-NCP, and then is type "D" or type "A" the appropriate diameter -- i.e., one that equals 30 gauge?
Or should one just pay the 10 bucks at SmartDevices and be done with it???