Hi Guy,
I've been using Linhof Super Rollex 6x7 backs on my Sinar X for quite some time and must say that there is nothing in the market that remotely comes close to the smoothness of these backs. Both of my backs are the lever versions as opposed to the knob type. When you advance the film...it's soooooooo smooooth!
I also have a Horseman 6x12 and I can only wish that Linhof had the equivalent format available.
James is right... you'll find them for a steal on Ebay. People just don't know what they're getting rid of.
Good hunting!
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