I've been shopping around and no one near me will do Argon filled double pane and only one place will do a vacuum. The price seemed astronomically high considering I can buy the glass and the local hardware store (single pane 2x amount to make double pane) for ~1/10 of the cost. So ranting aside, what is the best way to make double pane glass / window inserts from single pane glass? I was thinking about using something easy like a few 1/4" plastic tile spacers to keep a uniform spacing with weight or light clamp then applying heavy silicone bead to everywhere but the spacers, coming back later to fill in all but one or two of the spacer holes. Do a good inspection and cleaning if necessary, plug to have one hole left and then pulling a vacuum to ~7-10psi (~5 psi vacuum from ambient). Last hole (vacuum hole) will have to be plugged/corked with something else then silicone to ensure longevity.
My project calls for 24 ~8.5"x11" inserts, trying to weigh in my approx. time to build these and that I already have vacuum pump, I could have a 50% success rate and still save money so if it at all possible to do this at home/shop I'm going with that option.