Aft end showing secondary triple arrangement with two in-line upper blocks (#1 & #3 in the schematic diagram) and a single with becket lower (#2). Also shown is primary #2 block opening at aftmost position.The spectra line from the left comes off the internal floating block on the primary cascade. The secondary #2 lower block is a standard Harken part...steel sheave...likely a "Wire Rope" block with becket.