How to build a AWD TM2 train

I'm not sure how he did his version, if you just connected a custom side rod and pushed them into the holes then it would jam. I was thinking if I set the wheels so the holes are farthest apart from each other then put a pin of some kind that would fit in the front wheel so I could slip on a customized side rod it might work. The rod could slip a bit and not jam the wheels, similar to the original setup, but the pin would be much smaller than the original front axle.