I am neither old or crusty guys
just have a few hives and not outlaying money on unnecessary equipment when a syringe and liquid will suffice, I've always done a trickle mid winter. I warm my liquid and my hubby and I have it down to a fine art. Open trickle, job done in under 1 minute. And of course I also treat my bees in autumn (as I mentioned in my original post,) but due to a beekeeper (a loose term)who lives about 400meters from me and does not treat his bees ever I feel it necessary to treat in winter as well as autumn.
Last year I treated in autumn, had low and acceptable varroa loads all through summer and was happy with their health when I closed up for winter. I lost all my hives to varroa, I only realized when I opened them up to trickle! It was utterly heart breaking and very frustrating, with this non treatment beekeeper being the only cause I could come up with to my loss.
Now the thought of an OA vape done in mission impossible style stealth please imagine the music... in the dead of night to my neighbours bees is tempting for me to get the kit. How noisy are they?