Ended up just buying a new one from Amazon as they had next day free delivery.
Just happened to have 6.35mm coupler which is .01mm larger than a true 1/4" shaft.
I have to say super impressed with the build quality.
When comparing the OEM X-carve Z axis it makes me wonder why our machine does not come with a better z axis right out of the box.
It actually doesn’t make any sense to me why direct drive couldn’t be Incorporated rather than the small belt.
Seems like every little upgrade takes out a lot of slop and makes the cuts so much more sharp and accurate.