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Why do you think you have a twisted shaft? Some of the old DCOEs with the bronze shaft where problematic in that regard,but most of the new ones have steel shafts that don't bend easily.Sounds like you have a carb that is way off between barrels? Before you blame the carb make sure you don' have any vacum leaks or just a plain bad manifold.Some of the manifolds that these carbs came on where prettty bad.Any way a small amount of varience from one side of a carb to the other is normal at idle( idle mixture screws can be about a 1/4 turn differnce from the highest to lowest setting).If you still have a particular carb thats off remove it from the manifold,remove the side plates that hold the linkage and block plate.Under these you will find two springs that help to center the shaft.If the height of the springs is way off between the two(ie one is way shorter)then someone may have crushed it tightening the screw to much or it may have taken a set.A sure way to tell if your shaft is out of aligment with the bore is to look for the tell tale scuff marks that the throttle plates will leave on the inner bore of the carb.When you reassemble it with new or old springs if they are still good,keep tightening each side a small amount until the linkage is snug and the carb returns sharply under its own return spring power.Many people tighten these up way to tight.If the shaft is being pulled one side or the other use the opposite side nut to tension this out,but be carefull not to get them to tight,like i said they should return under there own spring power.Make sure and use the metal tab washer to hold the nuts once you have them set.Carb rebuild kits,springs and other parts are avilible from many different sources try Weber on your search engine.
 
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