Fixing unit description
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For information only, not for sale Here are the three generations of fixing units. Current sharpeners and accessories have the 3rd Gen fixing units and are incompatible with previous generations. The approximate timeline is: 1st Gen before July 2017, 2nd Gen from July to Nov 2017 and 3rd Gen after mid-December 2017 to now. To find out which generation of sharpener you have, compare the fixing unit on the back of your clamps to these three pictures.