Okay, all you 753 owners: Don't cold set your rear spacing!!
This I take to mean OVER-bending, with or without the help of levers, bars, muscle etc, until the frame springs back only as far as the new wider drop out spacing, and stays there.
Very different from the permanent adjustment procedure of cold setting is the benign act of simply inserting a rear hub 3-4mm too wide. I would be very surprised if this can cause any adverse effects on the La Vie Claire LOOK frame in question, given the moderate amount of force needed. In fact the rear wheel slipped in so easily that I had completely forgotten about spacing issues until I read the posts above.
Actually, I wonder how many of us really bother cold setting when 'upgrading' a 126mm frame, of any type of steel, to modern drive trains.