34.8 Clamped-on front derailleur on 31.8 seat tube, possible?

[MultipleFostion]

Hi all,

Next week I'll probably buy a new frame to replace my creaking old one, but the Look I'm considering has a 31.8 mm seat tube and my front derailleur, still quite new, has a 34.8 mm clamp. Should I buy a new derailleur, or I should just fill the empty space with a rubber sheet? Will I find geometry or adjustment problems? Any experience or feedback about this case will be much appreciated...

[Pkumble]

Buy a new one. Consider how much you paid for the Look frame. Sell you old one on EBay.

[alienator]

Which Look are you considering?