Snelgrove a very complicated piece of kit - to make awful enough, to use equally horrible. If its wanted to clear bees from supers prior to extraction, all I did was to buy 10 of the plastic cones that Th...es show in their catalogue (got them from Wynne Jones) and made a frame of 2" x 1" with a thin sheet of ply on top in which I drilled out 5 18mm dia holes. Used drawing pins to hold the cones over holes (could have glued and may yet do so) and bobs your flippin. Worked a treat and I have enough for another or to give to a pal. That method is for when I want to get on with other jobs as I can leave the bees to fly out in their own time but most often I merely use a 9" wallpaper hanging brush and sweep the bees off the comb before popping them in an empty super with a lid on top. Hope I have understood what you are trying to do. Have spoken to several longtime (elderly like me) experienced beeks around here and although some have Snelgroves, none, not one, use them.