I'm definitely not a pro in bellows making but I have made two of them, one for my 12x20 and another for my 8x10. They're hard and vary labor intensive. I say this because you only want to make a bellows once. I see problems using the bistol board like accidental tearing or water/weather. I made mine out of cloth that I bought at Joanne's which is a fabric store. Materials cost about $30 for the 12x20 and, hopefully, I'll never have to make it again. I used this excellent pdf source as a reference;
http://www.jbhphoto.com/wp-content/u...ingjbh2008.pdf
Just my 2 cents good luck
Jeff
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