Oerlikon Gun spare part?

[Grant Bowker]

Originally Posted by Brad Deckard

Could they be spacers which were left in the pouch when the factory made them, eg to get the correct size pouch hole inside the roll?

If I understood the original post correctly that all of the spare parts wallets have the tubes in them, it doesn't seem likely that even the dopiest of workers could get it wrong on 100% of a crate lot (unless they were trying...).