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To choose the correct parts for changing a cylinder's length, first pick the desired "Size" from Table-1 below. For example, an 1-3/8" cylinder length requires a B520-723 housing, an L583-474 cam, a B520-691 cam screw and a B590-298 plug extension. Keep in mind the cam referenced is for a Schlage L9000 series lock (except the L9060 outside). Tale as seen here: