Abstract: A deal with automatic line-locking includes a cam formed of a plurality of generally flat pressure-engaging segments or pressure pads that are angularly laterally offset to opposite sides of the cam plane an beyond the sheet(s) of flat material forming the cam, the segments or pads generally defining a line-receiving region having a generally uniform cross-section greater than the thickness of the sheet(s) of flat material configured to frictionally engage the line in the line locking position. Auxiliary sheave assemblies may be used to provide automatic failsafe operation by means of the cleat when raising or lowering an object on a hook or loop. A pusher may be used to automatically urge the line to move in the direction of the cam to lock the line especially when the line is released.