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@yoav
If you look at Wiggle or Chain Reaction for example, you'll see that band-on front mech come in a variety of sizes; 28.6, 31.8 and 34.9mm are typical sizes. The smallest are standard for old steel frames (Inch and a quarter), the rest for the variety of sizes that is modern frame tubing.
Yes, you can shim larger one down to size. I don't know where you get such shims and it may not look very nice but it should work.