Lo all,
I actually exchanged e-mails with Hard Knocks about this, realizing that my UKE might not work on the sheath sent out with Nathan's Field Knives.
For those who haven't encountered me, I designed this rig that I called the "universal kydex sheath extension" that was shortened to UKE by a forumite in the S!K subforum. There's a thread with pics and explanations in my sig-line, I'll link it here as well:
http://www.bladeforums.com/forums/s...sion-UKE-2-0-leg-straps-and-ferro-rod-holders
The short and sweet of it is that the kit is intended to be a simple, inexpensive, one-size-fits-all solution to user-carry-preference for a wide variety of different knives with kydex/plastic sheaths, particularly those with spacing for a tek-lok - Busse (Mashed Cat, Buy Brown, GodSpeed, 711, Azwelke, Kiahdex, etc.), Survive!, ESEE, Boker, Cold Steel, Buck, Becker, Gerber, SOG, etc. etc. It doesn't fit every model from every company, not by a long shot, but it works for a lot. And it's pretty inexpensive for what you get.
The thing is, I designed it originally to fit Azwelke sheaths with spacing 3/4" o.c. along the side, and it turns out that it fits S!K sheaths (originally designed/manufactured by Kiah) due to the slots.
But to make it more universal, I started including a little kydex 'bridge' and washer to stretch the UKE across 1.5" o.c. holes without actually changing the size of the base so that users who prefer angled-carry don't have a big hump sticking out.
Since then I've had one customer request that the device mount to a sheath spaced 1" o.c., so I sent along the UKE 2.0 with a modified bridge to accommodate 1" or 1.5":
But the kydex sheaths I've seen on the Field Knives so far have looked like this (credit to whomever owns this pic, I just pulled it out of a google search):
HK measured the spacing as 2"x2" square, and I'm not sure that the eyelets are the right size hole for the standard screws/pillars, they look a bit narrow...
There are two obvious solutions to mounting a UKE to such a sheath in order to maximize customizability:
1) I could supply a customer with a 'bridge' for that 2" gap between eyelets, they could use the screws that came with their FK sheath to mount the bridge and thereby mount the UKE (or a Tek-lok for that matter)
2) Simpler than (1), users could drill/punch a hole in the kydex sheath or the included plate wherever needed to mount the accessory of their choice, be it a tek-lok or UKE or something different.

As an example, I bought a much-less-sought-after TOPS BOB and modified it to accept the UKE by simply removing the attached clip and then drilling a single hole:
If anybody wants to send me their FK sheath to punch a hole in it or set up a bridge for mounting a UKE, just drop me a line via PM or e-mail (chiral.grolim (at) gmail (dot) com) and I'll get you squared away.
As for a home-brew rig without having something put in the mail - NetShocK, do you have any thick webbing or a spare leather belt? You can use something like this, folded over and cut to length, to form a belt-loop which you can then mount to the plate on your sheath by drilling a couple of holes and adding bolts/nuts or screws/pillars. And if you're looking for a dangler option using that tek-lok, you could just lace some cord through your tek-lok:
Good luck and let me know if I can be of service
