Hi Chris,
The new arrangemnt for the keel lifting rope takes the rope from the top of the keel to turning block fixed to an eye bolt on the end of the deck organiser, then to the winch as normal. This method removes one change indirection of the rope, i.e. the turning block on the base of the mast. To change to this system requires an eye bolt to be fitted and the single block on top of the keel housing needs to be repositioned to take account of the change in direction. It reduces the effort needed to rais the keel by removing the friction losses from one turning block. Not sure it is worth the effort !
With regards to the maintenance of the keel, our 235 is number 25, built in 2004. I changed the keel rope after three years. It was a little fraid so better safe than sorry for such a small cost set against the potential problems if it ever broke.
Our boat is about to be collected from Parker's factory after being in for general keel maintenance and an upgrade to Harken blocks inside the keel housing. Parker's have re-epoxied and anti fouled the keel, cleaned all the old grease away, replaced the keel eye bolts and fitted a new rope. The purchase cost of the eye bolts is not much more than an take away pizza, so if you have any doubts about their condition, just change them.
One interesting point that came up in conversation with Parker's was about the grease in the keel housing. They are finding that as the grease ages, it thickens and goes stiff, causing more resistance than not having any at all. So they have re-installed our keel dry, with out grease, allowing the water to lubricate it.
Hope this helps
Regards
Graham Ebb
235/25 Blue Jazz