I have a cotton cloth hammock I'm experimenting with in my yard and
tried a variation of the Risk whipping method. I put one double
constrictor knot next to the folded, hemmed end (using cheap 1/4"
nylon cord). I cinched it up extremely tight by taking the loose
ends and pile hitching them to two pieces of rebar (one on each
loose end). Then I pushed with my feet on one and pulled with my
hands on the other to make it untie-able. I wrapped the loose ends
around to the other side and tied them off with a square knot.
Ahead of this constrictor knot, and somewhat on top of it, I put a
larks head with some polypropylene rope. The double constrictor
knot used about 1/2" of hammock length and the larks head about
another 3/4". It works great. I would suspect you could put
webbing with a larks head right on top of the knot and against the
bundled, hemmed hammock end to reduce the total width of the end