I did find a picture from
Original AC Ace & Cobra by Rinsey Mills, p.47, 1990.
Note how the strap is not twisted but somewhat covers the bolt and nut
Also note in my pictures above: #'s 5/6/7 the strap is folded over with the raw edges pointing up under the bolt. I don't think the intention is to have the raw edges coming together and showing. Wrapping the strap around and over the bolt leaves the finished side of the strap up and showing, somewhat hiding the bolt.
George