How to fix/replace a loose gasket on a bearing tip?

The little gasket in my Bearing King is definitely loose or just old/worn. It’s this thing right here:

Does anyone know of a modern replacement? The tip often comes loose (or falls out!) when throwing.

Thanks in advance!

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If it’s the same as hubstacks it’s a 007 oring

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Does your bearing king have two bearings or just one?