He will make a rope for you for 15 coins, or if you bring him 4 balls of wool. It is revealed during The Fremennik Isles quest that Ned does not make his ropes from wool but trades it to a wool merchant in exchange for rope. It is revealed by talking to Jofridr Mordstatter that she is the person he gets his rope from, which is made of yak hair as wool is scarce in Neitiznot. He is willing to give you a "free sample" after the Fremennik Isles to bribe you into keeping his secret.
Ned is featured in the Dragon Slayerquest, sailing the player to the Crandor Isle to slay Elvarg. Ned, along with the player, will be stranded as the player's ship is shipwrecked while landing on Crandor island. The cabin boy dies before the Lady Lumbridge crashes by the hands of Elvarg. Interestingly, Ned makes his way back to Draynor Village as soon as the player finishes the quest but when the player revisits the shipwreck area, Ned is found to be stranded again.
Ned features heavily in the Dragon Slayer quest, because he is the only NPC who is willing to sail a player to Crandor. While doing the quest, players may speak to Ned about Crandor. He will tell you that he is willing to sail you there if you can find the right items. These are...
After the completion of Dragon Slayer, there are three Neds in Runescape; one in his rope shop, one on top of Klarense's Cruiser (can be seen from the boat that leads to Pest Control), and one at Crandor, on top of the Lady Lumbridge.
Ned, like many NPCs in Lumbridge and Draynor, used to offer jobs, but it was stopped on the 17 September 2009 update.
The table in Ned's house's examine says "Ned is making some rope here", yet he does not make his own rope. This may be why the coil never progresses, meaning he presumably started and never finished.