Here's a blast from the past - I've got a Dillon 450jr-B reloader that's not doing so well.  One of the arms on the index sproket broke on it, the primer assembly is plumb worn out, and the shellplate tray is not indexing quite right.  It's been in a box for years, and I'm not sure what else the closet gremlins have done to the poor thing. 

Is there any kind of upgrade path for this model at all?  Disposable income is much more than it was at the time, and I'm looking at a 550 or 650 as a replacement.  I understand that "moving parts wear out", but I'd be a fool not to ask. 

Thanks for any response, and Merry Christmas.

WoodyTX