No matter what you use for size it will be strong enough. Multiple wraps of a thread are extremely strong, plus your holding a guide, not the Titanic.
I use size A for underwraps whether it be nylon or metallic. For overwraps I sometimes use A. But usually I try to use C or D.
Like Tlap said.....usually depends on what is in your thread box at the time.
Bottom line is that it is easier to overwrap with a bigger thread than the underwrap. You can use same sizes but this requires more attention to detail.
I really take a liking to the size C Trimars threads....sweet.
I read that Gudebrod came out with a new size B.
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