Ray, you want a flat unwaxed thread. UNI offers a flat nylon thread in 70 and 210 denier (8/0 and 3/0 UNI equivalent), other brands offer similar products.
Cheers, Paul http://www.galesendpress.com -- Paul Marriner Outdoor Writing & Photography. Member OWAA & OWC. Author of Stillwater Fly Fishing: Tools & Tactics (Print [NEW] & CD), Modern Atlantic Salmon Flies, Miramichi River Journal, Ausable River Journal, and Atlantic Salmon.
