Since the OP was asking about a 700E, I went and looked at a 1939 700E. The correct fastener would be 700E-44C. I went and looked and found that some of my spare screws would be a problem. See photos below. I would have though the screw pictured above was the cross head guide screw, but I have no experience with the 18005.
The upper screw is from an unknown source, but clearly could be a problem. The lower screw is a proper eccentric crank screw for the 700E. Below that are Lionel drawings for the screw.