We need to get together on the beach sometime and compare the I20 and N6.0 systems - I would like to see if there are any differences. My 5.2 had the fork and ball and it took me a while to come to terms with and finally understand the nuances of my TheMightyHobie18 system and could work it mostly reliably. I then tried to carry that knowledge to my N6.0 but while they look similar they turned out to be very different in operation. Sometimes I think I just got lucky with the right combination of halyard shackle, ring, and halyard knot but now it's very easy and reliable. With the mast pointing straight forward, hoist sail until it clunks, slowly ease off halyard while pulling down on sail (this keeps the ring upright and ready for the hook). It was easy to assume that as hard as I had to pull to get the sail up that the halyard would remain tensioned - but it doesn't and the ring was flopping down out of the way if I just let the halyard go. To release, hoist sail, rotate mast either way hard, pull sail down to clear hook. It's been working first time everytime lately.