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 have nos adjusting cones for the later Musselman hub but have no idea if they are interchangeable. I can take some measurements if that would be helpful or could just send you one and you could try it. Let me know.