Selden Furling Mast Luff Extrusion — Service Manual

Luff Extrusion Tension

• The luff extrusion is always correctly tensioned at manufacture; a correctly tensioned extrusion makes reefing and setting the sail easier.
• Under sail the extrusion is pulled aft and, correctly tensioned, rests largely on the after face of the sail chamber.
• Re-adjustment is not normally needed – only if the tension seems too slack.

Do not over-tension the extrusion: you may overload the system.

Tensioning the Extrusion

1. Mainsail removed. Lift off the covers: press in one of the buttons and push, lift the opposite end and pull.
2. Loosen the lock screw enough to free the locking sleeve.
3. Push the locking sleeve up level with the upper opening; put in your left hand and grip it firmly.
4. Turn the tensioning screw with a winch handle in the drive unit (reefing winch). When the locking sleeve slips in your hand, the luff extrusion is acceptably tensioned.
5. Adjust the turn so the locking sleeve can be drawn down over the bottom of the luff extrusion.
6. Pull the locking sleeve down to the locking position.
7. Tighten the lock screw to hold it.

Measure the force on the winch handle with a spring balance. The table also lists Furlex Main 76 and Furlex Main 90.