: if you have an open fitting(like w/ a hole(padeye) or a loop) somewhere near
: at hand say in front of you: 2 methods: 1/ if the fitting hole is small
: tie a whipped say 3 in loop inl the end of the towing line and 5 ft away
: tie in a caribiner (or clip or plastic downrigger clip) to the same line.
: loop thru fitting, attach to carabiner (or clip). the tow rope is the
: harness.

: 2/if the hole is large, put the clip(carabiner etc) in the end of the line
: and tie in a loop(if forget the knot name) 5ft away or so. clip thru
: fitting hole into line loop.

couple of other simpler even
firstly, i guess the loop got to be abt 7ft or so away (perimeter + slack)for those in the previous post. the loop is called the butterfly knot
http://www.dk-sejlads.dk/dansk/gordetselv/knots/sloops.htm
For the setup do the large part first and swing yak over the line, then do the fitting/attaching, then you aren't holding the line when trying to do gross moves.

for these ones the butterfly loop is abt 10-11ft away from the free end:
1/ so you're across the towline, just bring the free end under any deckline (or both) or any loop fitting or padeye or ubolt somewhere between your toes and knees.(in a real pinch(probably real,too?) maybe just use the front of the coaming-quick release here in case of entrapment) ,and tie it off to the butterfly loop w/ a half hitch looped back up to the cockpit. so if you pull this about 3ft free end the half hitch unties itself.

2/same setup as above, line over deck thru any fitting or line handy, and thread the free end thru the butterfly loop back up to a cam or jam cleat in the deck somewhere. the 'harness' probably'll work (that is, it will slip from side to side) semi-ok, and you have a good attach pt.

-mick