I have the K Line reprint of the Lionel manual that I bought a long time ago. The drawing doesn't show any lock washer. I don't want to take apart my 736, runs too good !! I noticed my 2056 and 646 use the same boiler but different motors and only 6 drivers. The side rods, etc are shorter but same basic design. The 646, especially, is a nice runner. yes, it is all interesting.
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