This acetal grommet bobbin is designed for Crown/Samucksa Knee Lever - Neo Edition and its Crown/Samduksa KNEE Lever - Neo Edition ST 30+ Silicone Rubber Grommet. This will also fit all Crown tension grommets across the 301, 303 and 309 series, but the bobbin may not fit the 301, 303, and 309 models' shafts.
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