i believe i have found your missing eX !
My main form (shown in previous posts) centers around binding form as Ashley showed, and slipped as he showed. The perspective is of looking down at waist drawstring, to be cinching bight with right hand. The rest maid to same format to show differences with no other changes.
Despite as ABoK shows the wiki link does show a more common view of today, and is easier to compare with Sheet Bend. Both have the locking/hitch side’s bight slipped over the the host’s bight. But the S.Part and Bitter End of each serve differently on either side of the common central position of the locking side bight slipped over and down the host side bight
I still lean towards a single Lapp as Binding per ABoK vs. Sheet for Bend as shown. Only trusting a Dbl.Lapp for some Bend utility (but even then go with Sheet Bend for real heavy usage or risk; favoring double and some even slipped).
I have just pasted these in hear, as still tweaking. Eventually usually make internet link on neocities or wiki as like.