Vendo 149 Help

[Ken R]

Hi All,
   I am looking for a very small part and was hoping someone might have one or know the specific dimensions so that I might be able to pick one up at the hardware store or the like.  It's a simple part.  I'm looking for the steel ball that the carousel/vending drum sits on when mounted atop it's base.  It's basically a ball bearing the drum spins on.  If knew the exact size, I'm sure I could go to Fastenal and pick one up, but thought I'd ask here to see if anyone could provide any info on it.  I see it in the Manual I have, but it give no information about it other than it needs to be there.  Any info or assistance would be greatly appreciated!  Thanks.

Ken