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Re: 20 Denier UNI Caenis
Fly tying thread is available from several different makers and in a number of different colors. You can also get different weights - though - different makers may used different terms to rate the size/thickness.
It's not even remotely expensive either.
I use mainly the black 20 Denier thread by UNI Caenis. It is made for fly fishing and already black. It is round, already black and only 0.05 mm in diameter, similar to stretched sprue.
It could be available in shops with stuff for fishing. E.g. here .
The material can be straightened with a heat source and glued with white glue.
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