“bunting” => “buntline”
“constriction” => “constrictor”
Ian, you can do well enough with the buntline hitch.
It might depend upon your particular materials; you say that there isn’t
room (“round”=>"room) for a full round turn (as best naming goes,
you are making “a turn”), which suggests that the diameter of the
rope is equal or greater than that of the shackle!?
Since your refer to Ashley, I’ll presume that you have (access to) [u]ABOK.
A good noose-hitch to try vice the Buntline (which can be seen as one of
two ways of making a Clove noose-hitch) is tying #1821 around your line
after bringing it through the shackle; tie it so that the end is being tucked
down more towards the shackle than away. (In the image Ashley provides
for #1821, the structure I’m recommending here would have the line
coming from the left, going clockwise through the shackle, and then
be tied off to itself as Ashley presents the line hitching to a ring.
One needs to ensure that the end is oriented just as Ashley shows,
not making it like a half-hitch around its near part (which would
be something that could result from following leftmost image he
gives for #183, which he gives as a start to a larger knot). In short,
one wants the line of this hitch to be drawing the end ever more
surely up against the noose’s standing part (which I surmise will
give that part more padding and hence strength than for a
buntline hitch, where it will turn around the line directly, pull
against pull). (This entire structure, sans noosed object, makes
what I call a “symmetric Figure 9” – and is Ashley’s #521
Another hitch to employ qua “noose-hitch” here is the Anchor
Bend / aka “Fisherman’s Bend” – #1840. Draw it up tightly,
haul on the standing part of the noose-hitch and manually work
the knot snug to the shackle. Here, too, I see less hard turning
of the line around itself.
Btw, do you want to be able to UNtie this line-to-shackle?
Because if you to, I recommend the latter knot above. I just
gave both a quick stress test in some 8mm marine kernmantle
cord around 1cm carabiners, and I had to resort to trickery
to undo the former.
;D
Btw, substituting a Constrictor h. for the clove in the buntline (clove noose)
would likely be LESS secure. And the Constrictor knot is not meant to be
loaded qua hitch – i.e., from one end.