Hi Carl:
I have seen similar problems with loose crank pins on four of my EM-1s (you might take a wild guess that I model the B&O) where the pins were either loose or not in all the way. Nonetheless, the EM-1 is IMHO about the best Bachmann has done in quite some time. My biggest issue with the EM-1s is that the front porch is not on straight due to the screw that holds them is not drilled vertically but is off about 15 degrees, causing the front of the porch to be canted up. This causes the front coupler to be too high. Quick fix is a washer under the screw but it does not look right to my old eyes. Longer fix is fill the hole and drill and tap correctly. Haven't had time to do either - yet, but I am getting there.
Kind regards,
Bill