I have the Normal Rockwell Christmas train, which has the on30 2-6-0 steam locomotive.  One of the connecting rods popped off.  The rod that connects to the back wheel connects using a small screw.  But it connects to the rod on the wheel ahead of it with a small pin.  That little pin has popped out.  Can I get one of those pins somewhere?  Does it just snap back in somehow?  Or would I have to buy the whole wheel assembly.  Thanks in advance.