The stock shaft cup can break if you upgrade your motor or your prop.
This replacement cup has a hardened design.
The inner diameter for the plastic cup is 5mm. The overall length is 14mm. The max shaft pin length is 14mm too. The stock shaft pin is thick, it has a diameter of approximately 3mm. The drive shaft for the boat is 6mm.
BTW, 100% fill recommended.
The one below allows you to attach to the motor shaft directly without the metal. It is 3.175mm.
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