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A thread thread!
If you have a soft dowel that will fit, drill an undersized pilot hole in it, and thread it onto the rod, and remove it. Cut it lengthwise and use an ordinary thread gauge or test...

I think you need to change your thread title!

I just stumbled upon this fellow's youtube video, it's pretty good!

http://www.youtube.com/watch?v=qeOHrhM2GlE

Nice Epi!

That seems like a reasonable strategy and there are numerous instruments around the world that use reentrant tunings. I have a Cretan laouto that is traditionally tuned G2G3 D2D3 A2A3 E4E4. Look at...

How about
E4 = .010
A4 = .014
D4 = .023
G3 = .034
C3 = .056
F2 = .070

What does that look like for tension?

Compare these tensions:

The first set is standard guitar on a 25.5" scale (just for comparison):

len 25.5"

E4 .012" PL == 23.35#
B3 .016" PL == 23.3#
G3 .024" PB == 30.24#
D3 .032" PB...

Starting at the E4 and working down you're going to need a mandocello string for the C (.065 - .070) and a tugboat cable for the F...

If you mean actual pitch mandolin tuning, that is G3 D4 A4 E5 (instead of octave mandolin: G2 D3 A3 E4), then there is no way it will work. You're talking about tuning the first string an octave...

I haven't tried any of these...

How about Bb-F-C-G-D-A using the Bstring (.016 or so) for the guitar as the top, etc.?

Or octave tuning for the top 4, using a guitar D for the top string and...

i have an old epi ft45 cortez tuned in 5ths - it's a 24.75" scale instrument - FCGDA(e)

i use a thomstik .008 for the 'A' - and a .010 for the re-entrant ('e') - i hope you are successful in...