Wheels for drill-gearboxes?

[Coolspeedbot]

The hex hole wheels I have used in the past secure onto a hex hub. The bore of the hub as around 0.5mm larger than a drill motor but a thin copper shim allowed it to be used. I'm not sure what the current status of banebots manufacture is.

When I checked Bangbots it says the bores on their wheels are now 1/2 instead of 3/4.