Has anybody had any issues with cracks in the plastic hubs(that hold the side rods) that fit on the ends of the axles on the Davenport 0-4-0 diesel.  I have a dozen of these units and after inspecting them for cracked gears, I have noticed that the plastic hub sleeve where it pushes onto the ends of the axles are cracked on most of my models.  Also, on those same side rod hubs the portion of the hub where the metal pin inserts into to hold the side rods on most of those are splitting or cracked as well.