Several times in the rule book FIRST implies that the retaining feature should be a large knot stuck behind the retaining pin. I feel that this would not be ideal, as enough force could make the rope slide underneath the retaining pin and out of the Davit.
Our team wanted to tie the rope onto some steel rod or torus and having that sit behind the fingers and retaining pin. Is this allowed? I have reread the rules several times and am not sure is having other things other than the rope to help secure it is legal.
Check the team updates! The retaining feature may now extend up to 2" below the fingers. (I think it was in #5). There are also several threads already talking about this.