Join Date: Mar 2003
Location: Beaufort, South Carolina, USA and surrounding islands.
Bikes: Cannondale R500, Motobecane Messenger
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I'm assuming you have an Adams. You should have the correct shim, or else it will wobble excessively. You can order a shim kit from a bike shop or online retailer. The hack way is to cut the existing shim. You'll need a vise and hacksaw to do this, and patience, as you cut the shim longways.
While you're at it, tighten down the two bolts at the universal joint to stop wobbling.