I know there are several threads here about updating the mainsheet block. for quite a long time, I was planning to go with the swiveling cam cleat and a ratchet block, as described on the forum in a few places, but it seems like this option might not work as well as thought, at least with the Harken 241 swiveling cam cleat (discussed here, scroll down to comment #38). I instead used Wayne's method (thanks Wayne!), and just put an eyestrap on the deck, connected the ratchet block to that, and then mounted a standard cam cleat on the cockpit lip (replacing the good ol' hook). Here are 2 pics of the final result - and I'm pretty happy with it. Note - I never did get the stand-up spring to work, but I don't mind installing the block each time I sail.