I'm going to rebuild mine very soon, and it's about $5-$10 so might as well do it.
I've never taken it apart or anything, but from the parts list for it--it sounds like the ball bearing more than anything in your case.
Try Cascade Innovations or Mod Quad.
http://modquad.com/store/detail.asp?PRODUCT_ID=KS-REPAIR
http://67.199.65.66/cascade_innovations/newlook/