Loved the video Stan!
Wylee, Nefru there is some pretty good threads in the archives on hay sets. Everyone has different techniques and purposes. I live in south central AK and we get varying temps through the season, anywhere from +40 to -20 and that changes weekly
Then there is the snow, anywhere from none to a few feet. I get alot of that wet sticky crap, up in the interior for the most part due to colder temps they get the dry snow. Don't get me wrong, when I say dry it is powder but you disturb it it becomes hard as a rock.
I use snow holes, same as a dirt hole set, if the temps stay +20 or below. Wax paper under the trap in the bed and wax paper over the trap under the loose jaw. and a real thin layer of snow over the top. You can do that with a paddle, a frying pan utensil, or use a sifter held up high. Less is best
Witht those sets I won't touch them again until we get 6+ inches of snow or we get a thaw.
For the hay sets, just picture a dirt hole made out of hay in the snow, bed the trap on top of hay, and put a vary fine layer of hay over the trap just enough to conceal it, Alot of time I will take a sifter and sift snow over the top to blend it in a little. And again I won't touch it again until we have +6 inches of snow or get a serious thaw.
The best thing I can tell you is to read and go try different things out and find what works on your line. There are a ton of different methods out there, finding what works for you is the challenge