I assume he's referring to these things:
http://store.catsailor.com/tek9.asp?pg=products&specific=jmorenhnf0I much prefer these to dogbones. Easier to get on and off, and much less painful when they hit you in the face.
I have adjusters on the rear trapezes of my boat. I find it really useful to be able to lengthen the trapeze when trapezing right at the back of the boat going downwind.
Paul
Are you referring to the rope loop on that page? HARKEN BLOCK ACCESSORIES: LOUP, 11MM DIAMETER BY 400MM(16") LENGTH
HARKEN BLOCK ACCESSORIES: LOUPS, 11MM DIAMETER BY 400MM(16") LENGTH Developed by Harken by Aramid Rigging in..
Or the wire loop (as on my Tiger)?
My Tiger shows the adjustable trap as the crew one so I'll try switching.