How much shim is TOO much?
I picked up a nos SRAM Force front derailleur with a 35mm tube bracket (at $27 too good to pass on) with the intention of installing it on my old Raleigh frame which has a 28mm diameter seat tube. 7 mm doesn't sound like a lot until you attempt to match up a 35mm ring on a 28mm tube....urgh! Is it logical to attempt to set the fd in place with a shim to make up the difference? I have the ability with available raw materials along with my Dremel tool to manufacture a shim, but am concerned re: appearance and functionality. Seller will accept it back on my nickle for shipping (which is fair), but doesn't have any Sram with 28mm bracket to replace it with. This is a nice unit, hate to send it back... On the other hand, I suppose I could list it on ebay or local CL. Suggestions?