Hcigar Nemesis threads: 21x0.5 or 20.5x0.5?

[kc0716]

I am trying to buy the hybrid mod for hcigar nemesis but the website says
CAUTION: Some hcigar clones use 21x5 threads. These work with 20.5x.5 Nemsis only.

Anyone know which "versions" of hcigar uses 20.5 x 0.5?

 

[crxess]

Likely first release units as HCigar is supposed to be part swappable with all other 1:1 clones and the original now.

Since serial numbers are random and for an authentic look they will not help in identification.

These work great:
$11.94 Digital 150mm (6-inch) Caliper at FastTech - Worldwide Free Shipping