I would say hold off on the raping and pillaging from your other tool-head.
I am willing to bet that if we ask @proclaim & @simon to get replacement ring magnets in the store, as well as replacement connecting rods (which it looks like you need), that would not be very much to ask for.
So far (knock wood) my ring mags look ok, but I am starting to see just a hint of wear on the connecting rods too.
I'm also starting to see more of my lubricant on the carriage rods turning black faster, so I am starting to wonder about the state of my linear bearings. That black stuff has to come from somewhere.
I think the store really needs a Mechanical Parts section. I know I would like to replace the carriage rods and linear bearings with hardened steel and better bearings, and others have mentioned it as well. The magnets and connecting rods are definitely another item that will eventually need replacements too.