(Monterey) bayblade ("beyblade")

Your kid can smash all those commercial tops with her own homemade one. You can also teach yourself and others about the factors involved in rotational inertia and angular momentum. 

You'll need:

Wood
5/16" dowel
Fender washer to match the diameter of your hole saw
Long staples for heavy duty stapler, around 3/4"
Brads slightly shorter than your wood is thick

Hole saw
Saw
Drill with bits: 5/16, 19/64, 3/16
File

Step 1:

Cut a circle out of wood stock with a hole saw.   We used the the one with about 2 inches radius. 

Sand it smooth. 

Mark around the hole with a penny, and a diameter line for placement of the staples later.

Comments

[Goodhart]

Very nice and simple to make.