Regarding bumping ads in the classifed forums, we've just installed a new (customized) add-on that will change the way ads are bumped to the top. Please refer to the post "Bumping Classifed Ads" for details.
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I might have one Brian. I will look today and let you know.
UPDATE: Sorry, I didn't find one. I did find a 16 tooth 3 tab sprocket, but it won't go on a Bendix driver so I think it must be a Shimano or something else. It is very close and could be made to fit if you can't find the correct one.