I'd look closely at the alignment. I don't know the specific extractor you are using, but I'm assuming there is a sealed bearing cartrige of some kind. If they are misaligned, or if they are overloaded (to much pressure in the mounting) they will wear quickly. A decent machine shop (or perhaps a votech school) will be able to do this for you if you don't have the proper equipment (most of us without a decent machine shop will not).
deknow
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