To orient you, Stu, the picture was taken from inside the boat looking up and aft at the left upper corner of the hatch opening.
The hatch boards are not in place but the horizntal acrylic hatch cover is in the closed position. The wooden bar that is used as a handhold to move the acrylic hatch cover was mounted by Hunter, on the acrylic hatch cover, about 2 inches forward of the aft edge of the acrylic. In the picture, you can see the two inches of acrylic hatch cover aft of the bar.
On a H376, the companionway opening is framed by a vertical U shaped aluminum channel (you can see one of the strap eyes attached to it). The two hatch boards slide down on top of each other in the channel. The horizontal acrylic sliding hatch cover is slid aft to close the companionway; the aft most inch or so of it covers the top edge of the top hatch board. Thus, you can’t get the hatch boards out, to open the companionway, unless you slide the hatch cover forward. If you tie the hatch cover bar to the channel thru the strap eyes, the hatch cover can’t slide forward. Thus, the companionway can not be opened.
Allan