Hedgehog or Hamster Bearing Training Wheel

This is a Hedgehog wheel I designed and built for my daughter. You will need the following to complete it:

1 x 150mm long 6mm threaded bar.
2 x 626 Z bearings. (They are 18.8mm outer diameter, 6mm inside About 6mm thick as well)
7 x 6mm Nuts
2 x 6mm washers

To assemble the spacer fits in between the two bearings and can be fastened with the nuts.
You will add a washer between the wheel and stand as well. I used two nuts to lock the nuts on either side of the shaft/threaded bar.