Mounting / Connecting The Fisher Price Motor

I was talking with one of our mentors about connecting to the FP gearbox output “shaft”

And the first thing that he said was that a 1in or 1 1/2 in nut would fit in there

We haven’t been able to get a nut that big yet, but I believe that this may also be able to solve our problem

Very interesting solution. But arn’t most nuts hexagons, and not octagons?