mouse trap car axle holder with ball bearing insert,axle and wheel

The axle
At the rectangular end of it there is a cut out that is 1 cm deep and 0.5 cm high and about 2 mm thick where you can insert a regular sized Popsicle stick or you can cut out Popsicle stick like shape at the end of a piece of wood for better stability which will make it a lot better performance wise.
The axle holder has a cut out for a ball bearing from fidget spinners, use hot glue to hold the ball bearing in place inside the axle holder.

The axle
The axle should slide in th