What did the K suffix for the old D800 and D400 represent?

The  K suffix for the old D800 and D400 substituted the standard thumbturn for a 2" Handicap lever (thumb-turn) on the inside. 




This was not the standard thumb-turn. This thumb-was longer and was a black powder coat (622) finish. Also, the shape was not the same as the standard thumb-turn.


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