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Vs7 1 Fly Box Flat Top
My approach on this is to eliminate everything that is unnecessary. In this case I discovered it may be possible to use the screws themselves without any collar or extra clamps to apply the pressure needed to hold down the porous material sheet. This eliminates obstructions, gaps or grooves that the flies may fall in or get stuck on. I also added the ribbed nipple for the Co2 hose and the spout to help get the flies back into their tube containers.