I've been building a bellows/puffer drywasher and I'm to the point of trying to figure out how much canvas material to cut out for the bellows - how much at the widest throw point, and how much throw it needs to have for a riffle/bellows box 12"W x 24"L size. 7", 8", 9", 10", 12"? I'm also needing to know what to attach the material to the box and bellows flap with - glue? and if so what kind, staples and glue? Silicone adhesive? Any and all help is greatly appreciated. And I have more questions with these being a good start. I'd like to cut and mount the bellows material today if at all possible. Best regards, Gerald GPAA Life Member