Always is the word. I had to smile at your words. You'd imagine laying on a sheet of thin perspex or acrylic would be a simple matter but it takes me several tries to get it right. Maybe if it was a tad wider (with corners rounded to ensure the roof went on easily) it wouldn't fall in so often. Hardly a big issue but I've got bees in more than 50 of them at the moment.
Yes, queen mating is slow. Had quite a few failures earlier but now most seem to be finding short windows in the cool weather eventually.
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