Where did you find a custom PVS14 to spotter adapter? I would love one for my Swaro STR80?
From a member it turns out! He cut one from a piece of Delrin, so it should be perfect. I don't want him to get inundated so I can't mention who did it. That's 3 members that have made custom parts to make my field setup possible, not including myself or dealers. When I get the adapter I'll take more pictures and put up on here somewhere, probably under observation devices and/or night vision.
But I CAN give you the dimensions that I gave him to make my adapter. It's not that difficult, if you can find a piece of tubing with an ID of 1.445 or so and a thickness that'll support up to a 1.495 bore and still be thick enough to thread and is 2" long, you have the foundation. I'd recommend aluminum, UHMW or Delrin, which is one I hadn't thought of but ideal and what I'm getting. ABS plastic may also work if it's thick enough, so possibly a pipe fitting from the hardware store. Or two fitted together, whatever works.
The OD of the PVS14 is 1.445 and the OD of the USO is 1.495, so you'll wanna bore it .005 over and then hone with sandpaper for the perfect fit. The depth of the PVS14 side is .85 and the depth of the USO side is 1.2. There is no space between the two, the PVS should butt up to the USO in the mount, more or less. There is a space .2 between the battery cap and the 14's obj. You'll need to cut a channel at that point about .7 or so long, depth depending on thickness of your material. One to three set screws can be installed, my idea is to use one and over bore the hole and thread it for a helicoil and then use a 1/4-20 or larger nylon screw in the right place on each side. A larger nylon screw will apply more force while reducing the risk of damaging the 14's focus ring vs. steel, and I'd rather risk it falling off than breaking in the mount. To be safe, I'll probably still tether the 14 to the mount. Habit. But that's it, the dimensions couldn't make it more simple. You can probably get any shop around you to make this for little of nothing, it's that simple.
The other option I was considering was figuring out a way to install a section of rail near the eyepiece (how I'd get it from the mount to there I wasn't sure). Then I could've used a QD Larue PVS14 rail mount. So there's more than one way to do this. The tube is easier, or was given the geometry of my mount. Had I made it longer I could have installed the rail easily.
IF you don't wanna make it and don't mind spending money on it, I started a thread asking for a part like this and one guy got back to me and told me about Monoloc. You can look at that thread or look it up, but Monoloc makes some universal PVS14 couplers and one is for a spotter. They're all about $200 but they're pretty nice looking and have lever locks and probably a band inside that clamps it 360 degrees. Up to you.
Another thing little trick I'll mention, and it's besides the point, is that I use a Butler Creek flip cap on the PVS14's obj. The one with the button, the one made for a scope's eyepiece (I paint the button black). I orient it so it flips up but doesn't obscure the IR lamp and I drill a hole the exact same size as the one in the OEM rubber cap it comes with. Viola! Nothing to lose, tie off or have hanging. They ought to come like that.