I started my first response before you posted your photos. In your case if you loosen the set screws on the flywheel you should be able to slip it out on the motor shaft enough to get complete engagement of the nubs on the drive shaft ends. Those short drive shafts are more difficult to lengthen than ones which are longer. I would not want the tube or pen barrel you use to touch the socket. If the shaft diameter matches the ID of a piece of brass tube that may work as it is much thinner than a plastic pen barrel. However in your case loosening the flywheel and pulling it out a bit is the proper cure. I would order a new drive shaft if the nubs are the least bit damaged. The ultimate cure is for Lionel and MTH to move production out of china. There are far to many quality issues with the product coming from china. Korea and Japan never had this level of quality control issues. J
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