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Message: [QUOTE="andrew, post: 257363, member: 16274"] I have also noticed the top ring groove is tighter than the bottom. I always thought the two rings were the same, but I couldn't get one to fit in the top groove. swapped them over and...voila! The manual doesn't mention anything about this, but that has been my experience. There was a forum topic about this some time ago. As for your bore, like you said, it's hard to say without looking at it but I can tell you they will take a fair bit of wear without adverse effects. If it's not deep enough to catch a fingernail in, I would be inclined to forget about it. Cheers, [/QUOTE]