The typical Flat Plate Boat Hoist is available, rated anywhere from 3000 lbs. to 8500 lbs. and lacking only a surface to mount to; an adapter sleeve and drum for wire rope hoisting. Looking at the specs for the smaller units (4000 lb. class) they have a travel speed of about 3 ft. per minute. You'll sometimes see these advertised as 'open' units because the wormgear is exposed. These units are usually covered in their entirety with a white plastic weather shield.
Please try to visualize what a completed system might look like from above with the original Fulton K1550 removed; a plate sufficient in size ("A" plate) to mount the flat plate hoist to, where the adapter sleeve is allowed to project through - along with a corresponding plate ("B" plate) attached to the tower face to which the drum is mounted and attached to the adapter sleeve. Both plates (A&B) welded together along their intersection would provide a simple solution to supporting both the hoist and drum. The two plates welded together as one, act to provide mounting for the flat plate hoist (rotational forces) and drum (tensional forces).
