See the photo below. I believe this hardtop rigging of the mainsheet was an original Amel design that was later removed from the hardtop on the A55. I have photos of other 55 hardtops without this mainsheet rigging, so I tend to believe the photos, but do not know when or why this change was made. 

Does any 55 owner know why the hardtop mainsheet rigging was removed?

Bill