So, we're having a little trouble with how to attach the wheels.
We're using the new Argos drill motors and some cheap wheels from Homebase.

The motors have a M5 reverse thread internal and a M10 external thread (we think).
Motor.jpg
The wheels have a 13mm bore, not threaded.
Wheel.jpg
Any recommendations on how to attach the wheel to the motor?
If anyone has any links to correct size bolts or other parts to help, they will be really appreciated.