okflyfisher, thanks for this thread, it is quite timely for me. I needed to replace a worn line, and SA discontinued my old favorite, the Supra, and the only DT in their line up now comes in at a hefty $75. So I decided to try Hook and Hackle's line in the DT5F. They are, of course, loopless, but to save $45 I can tie a couple knots. I did a "test" with the castwell knot direct to a leader loop, and I could not break the connection, as much as I tried. Despite all the endorsements, it takes a leap of faith to trust such a simple knot, but a fine film of Zap a Gap will add to my confidence. This rig is less bulkier than the nail/perfection loop I am using now, and has the added advantage of being easier to replace on stream if needed.
For more info this is a good thread also....
http://www.flyanglersonline.com/bb/s...be-a-nail-knot