+1 to Scottryder.
and Those Cyclone shifters can be a real PITA to tighten down enough. As Bianchigirl said there is usually a small nubbin brazed onto the underside of the downtube and you want the clamp band to be above that. Its there to keep the shifter clamp from being pulled down the DownTube by the pulling force of the shifter cables.
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--Don't Panic.