Thread Sizes - Where to buy? - moved and retitled by moderator in Masting, rigging and sails Posted October 4, 2014 When I was searching for threads of various sizes I had good luck at jewellery/craft stores - not pre-made jewellery but the 'make your own' places. They are also called Bead Shops as well. Couldn't always find the correct colour but that just meant some home modification. Hope this is of some help.