I have had the Lionel Big Boy for many years. I was recently changing the traction tires and found a spring that fell out when I had the engine on its side. It is part #6101104038. It is held in the frame by a shoulder screw part #6101104037. The screw was missing so I ordered one from Lionel. My problem is I don't see how I can put this screw and spring back in the engine. It is used to hold the rear gearbox assembly. I think I have to remove the main frame from the boiler to screw it in but I'm not sure how to disassemble the frame from the boiler. Any assistance would be appreciated.
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