Carvon 2.5 drive wheel question

How are the drive wheels of the carvon motors modified? Can you do these modifications at home with any Abec11 compatible wheel?

If you have carvons, a picture would also be great.

Ill give you carvon his build thread later,

Here you go: Hes using a lathe to cut the motor shape out of the urethane.

Thank you. That was what I was looking for!