The little line of the top patch allows the spi to go into the snuffer a little bit easier as it allows the spi to spread out a little. I'm currently only using some 100 mm or 4 inches of it. Greg Goodall said he found now uses the same length on the Capricorn F18 as well. It seems that longer has no serious gains while forcing longer socks to be used and shorter makes snuffing a little bit harder. Besides this system allows quick and easy hooking up of the spi to the retrieval line. I do run a little differently as couldn't get my 4mm retrieval line and the 3 mm top line to go through bead easily enough. So I have a very small bowline loop in the top line and run my 4 mm retrieval lien through the bead (and not the top line) than run it trhough the little loop and tie a figure 8 knot in the end. This figure 8 knot it then to large to pass back through the loop. Now I shove the bead over the loop and figure 8 knot and it jams the knots into place there.
How ever you can use a larger bead and do it the AHPC way.
Wouter
Wouter Hijink Formula 16 NED 243 (one-off; homebuild) The Netherlands