Now that 220 B&W films are pretty much unavailable, I'm interested in your ideas of what to do with all our various 220 backs. Ain't gonna be able to sell them, and I'd hate to see them all end up in landfills. Anyone know any fun ideas / conversions for them? For me I have Bronica ETR backs and Rapid Omega backs. So these ideas may be particular to certain backs/manufacturers but I'd like to see what people think.