I have the same "big dog" leash that Randy Smyth was using on his F18HT (but I actually use it for my big dog). It is made by "Standard" and is a Flexi3-5 model and I bought it at Wal-Mart a while back. Although it claims to hold 16feet of line the line that comes in it is a bit small at 1/16". I haven't taken it apart but it looks like it will accept something up to a 1/8" halyard. I also don't think the springs or the screws will hold up to extended saltwater exposure but at $12 or so who cares?