That was really weird. When I posted this, I couldn't see the past ten or so posts. My response was right after spanner76's. Apparently, I'm having some caching problems.
At any rate, as wmkjr inferred, I was (somewhat jokingly) offering up my Armored VF-1J as a test subject. I haven't had the chance to buy one of your stands yet, but I can put the adapter on and hold it upside down to see if ithr Valk will stay on the adapter. I'd be happy to mail it back to you with pictures and comments as well. I covet your stands, but I'm still growing my collection, and just prior to my most recent purchase my wife made me promise that I would never buy anything again. Ever. Fortunately, she'll probably forget that in a few months . . . .
Since I can't afford one right now, I thought that the least I could do was offer to help, to the extent I can.
Sorry for the weird post. I'm not sure why my phone decided to a weeks' worth of posts.
--G