Cup and cone BB race: how many balls? Room for another?

doctor-bond

Feature Bike
I’ve been titting around with old Cup and cone BBs (wonderfully over built things), and have a vague memory that you can remove the cage that holds the balls and add an extra one? It’s a tricky thing to Google, so anyone here know if it’s a goer before I start hacking cages and measuring balls?

Ta.
 
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