I've got a box full of bronze bushings, and I've added them to some of those cheap Alco motors I convert to standard, the holes are egg shape and I thought about putting them on this but said ---what the hell---everything is tight, smooth and straight. Never thought about a Marx motor--the trouble with Marx is the lack of off the shelf parts ---I can get a boat load of Lionel Pre and Post War gears and play mix and match until you get it right.
I might add that you could use bushings on the axle shafts or make life easy and just slide in a Marx motor.
I've got a box full of bronze bushings, and I've added them to some of those cheap Alco motors I convert to standard, the holes are egg shape and I thought about putting them on this but said ---what the hell---everything is tight, smooth and straight. Never thought about a Marx motor--the trouble with Marx is the lack of off the shelf parts ---I can get a boat load of Lionel Pre and Post War gears and play mix and match until you get it right.