Multigroove Dowel can be used as an axle for these wheels. Ensure the dowel is long enough to go through the wood piece (car body), the thickness of both wheels plus enough room for the wheel to spin freely. Attach wheels to ends of dowel pins with a bit of glue and light pressure. Recommended Multigrooves:
1/4" x 1 1/4" ,
1/4" x 1 1/2" ,
1/4" x 2" .