Hi there Big Max.
Yes, the 499 is still a current item. I checked with my LHS for the replacement parts, and they couldn't find any reference to separate parts...only the complete unit. I sent an email off to DuBro last week, but I have not heard anything back from them. At about $30. per balancer, I'm not happy with the prospect of spending that much, just to replace the shaft and cones....so...I have put up this thread, in the hopes that I may find someone with one, or two, to sell. Or, hear of some real neat idea to use something else to do the same job of holding the prop in position for balancing. Anyway, thanks for the note, and have a nice weekend.