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This shaft is not compatible with the Crown 303 or 307, and we cannot recommend installation into the 309 MJ or Helpme unless you replace the original tension grommet bobbin with the DX variant.
Model and Part Guide
The following reference list provides information of the battop, Silicone rubber, and bobbin style installed into each recent Crown model by the manufacturer. This is helpful if you are looking to purchase the correct grommet or bobbin for your chosen model.