The clue to your problem might lie in your description of the symptoms. You say the luff hangs up at each joint so the common problem of a loose set screw is probably not the cause because that would only occur at one repeatable location. On the Profurl the foil sections are held together, and in alignment by internal fish
plates which are locked to the foil by set screws. The holes in the fish
plates into which the screws are located can become worn by the stresses on the joints as the foil flexes during use.. To check for this condition look to see if the luff tape is worn in the joint locations and also if there is rotational movement of one foil relative to the next one as you twist them by hand back and forth at each joint.
Checking the joints is never a comfortable operation. I attach my self in a bosun's chair and loop a strap around the foil and have someone haul me up the foil using the halyard. Then I can stop at each section joint and check it for loose screws or loose joints.
To repair a worn fish plate it requires lowering the whole system to the dock
. When I removed my system for overhaul
I used the spinnaker halyard to support the mast as has been suggested, and I used a 1 inch wide strap attached to the jib halyard to lower the foil. The strap does not slide as easily up the foil as a line does. I attached this strap to a location about one third of the way down the foil from the top so as to minimize the bending as the foil is lowered to the ground. If you support it only at the top this puts a lot of bending stress in the center section as it is raised or lowered. I tried to support the foil at two locations with a bridle
attached one quarter and one half way down but I had difficulty controlling the support locations as the angle of the foil changed as it was lowered on the way down.
Once the system is on the dock
I repaired the loose joints by drilling extra set screw holes at the loose connections. You can buy the special set screws from a Profurl dealer, (get a few spares) and drill and tap the foil for the extra screws and drill the fish plates to accommodate the locating peg on the set screw. Don't forget the Loctite.
Voila, piece of cake!
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