Those should work fine. What kind of pilot nut do you have on your engine? Can you take a picture?
The mesh could still be too tight. You need to take a piece of paper and see if it can slip between the CB and the spur when you turn it without shreading the paper.
when you roll the truck back and forth the center shafts will spin. If you hold the truck up and turn one wheel the other wheel should turn the other direction.