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This is the Leeward mainsheet configuration demonstrated in the 1987 Luger catalog.  The set-up has many good points, but doesn't allow the owner to easily take advantage of the boom's roller furling system. 

Also, if this system is employed, be sure there is ample support/bracing of the centerboard well.   The shifting and changing stress from the
sail on the well structure could cause excessive stress and
fracturing of the fiberglass.

This alternate mainsheet system
was also suggested as a rigging
option in the blueprints that
accompanied my 1981 Leeward.

This method would allow the boom's
roller furling feature to be easily
employed. 

A loose tang is added to the end of
the boom, and a topping lift holds the
boom while the sail is adjusted. 

(Be sure your sail doesn't have
a roach that will rub against
the topping lift.)

This is the mainsheet rigging option demonstrated in 1974's catalog.

This is the mainsheet system used
on some early Leeward 16s back in the sixties.  I've seen a system like this used on AquaCat catamarans.

This photo came from the
1964 Luger catalog.