Thakkrad Sigmundson is a Fremennik craftsman from Neitiznot. He is located in the building directly south of the bank on the island, standing in the south-western corner of the burgher's room.
He can cure yak-hides for 5 coins each to make cured yak-hides. To do this, players must have started The Fremennik Islesquest up to the point where they are preparing for the fight. After the quest, players can have him cure yak-hides by right-clicking him and selecting "Craft-Goods". An alternative method is to use yak-hide on him, which can skip one dialogue screen.