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Sharpco,I suggest you contact Tormek support (support.tormek.se). You may be able to receive a warranty replacement part. Here is a link with the part number:https://advanced-machinery.myshopify.com/products/3560-o-ringO-rings are common plumbing parts. You may be able to find a matching replacement part at a local hardware or plumbing supply store. (Bring your broken ring and knife jig with you.) If you find a match, I would suggest buying at least two. The gasoline to drive to the store will probably cost more than the O-ring.Ken
Sharpco,I don't recall any other posts with broken O-rings. Please contact support and post.Ken