SO 37.1 Furler Modification
Conversion of an original below deck headsail furler to a "standard" above deck system
Here are some JPEGs to explain the modified furler setup on Nikita (1996 SO37.1)
A ProFurl unit (instead of the original stock unit) was used on above deck furler modification:
A new chainplate was added forward of stock location. The new plate has a hoop welded to it along the long edges of the plate. The hoop is formed to loop around the center rib of the stock stem fitting and is also bent around the stem towards the masthead. The head stay and the base of the furler are attached to the eye of the hoop and this repositions the furler to an "above deck" location. A nylon plate covers the old furler hole.
Since this came with the boat and I'm the second owner, I do not know who fabricated this mod but it does not look too difficult for a standard rigging store.