Bobohamer

I am new to building SIB and need recommendations on thread. "A" thread and #24 are recommended in building John Fox's III Bluenose but where do you purchase such thread? It seems that most use fly tying thread, but is there a certain kind? Fly tying thread seems to separate on me. Where do you purchase your thread from? Your advice would be appreciated. TNX

CD of The Bottle Shipwright 1983-2016. Purchased from Bob Little I believe for $25. Will past it on for $20 postage included. TNX Contact me at abeckett[at]gci[dot]net