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I think this difference may come from the age of your rods. I remember hearing not long ago, that Rev switched to hollow ferrules in all rods claiming that they are as strong as the solid ones. Granted, I have not looked into this much, but you tend to hear things while living in a kite shop.
Ben posted about the new hollow ground ferrules that Revolution were introducing on the 18th November 2011.
Cheers
Stephen
