It's difficult to see in either the illustration or the photo, but the most forward segment of the hook was a V-frame. It was covered by a pair of triangular doors. When the hook was extended, it was retained in its stowed position by a latch until the hook engaged a cross-deck pendant and then was released to pivot in line with the two hook segments aft of it.
As if that weren't complicated enough, the hook throat included another Vought innovation, a "trigger" that forcibly ejected the cross-deck pendant after the aircraft was stopped to insure that the hook released the pendant. If it didn't, a sailor had to run out and knock it loose so the airplane could taxi out of the landing area.
During shore-based trials at Pax, the rectangular fairing over the aft hook segment came off during three arrestments, so it was reattached to the V-frame and hinged to the side to allow the hook to extend. The pendant ejector was deleted "in an effort to simplify the arresting hook assembly." The whole experience was summarized with the statement: "The arresting hook assembly is complicated, and its practicability for service use is doubtful."
The F7U-3 had a conventional V-frame hook attached to bottom of the aft fuselage.