I bought the ceramic insert salmon-sized bobbin. I would imagine that any GSP thread would work in it. Using those, there would be no need for the heavier denier threads or kevlar.

I've tied many saltwater flies using the clear mono threads, too. Those would be no problem.

But the final authority would be Mr. Ekitch. From our computerized conversations, I can tell you that he will answer any questions you have in a timely manner.

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aka Cap'n Yid.
Stev Lenon Trout Ski, 91B20 '68-'69
When the dawn came up like thunder