I have had a Harken MK1 Unit 0 on my 1991 30T for over 20 years. No problems whatsoever. Drum is located below deck in the forestay hole with blocks to direct the furling line through the deck and back to the cockpit along the port stanchions. The boat is winterized now (mast unstepped and boat covered) but I found an old picture of the boat showing the furling system in place. Hope this helps, Fred.