Typically we tell new spinners to seek balance in their plied yarn ... see How Much Twist do I Need When I Ply? for that advice. If you let singles rest, the twist in the single is still there, but dormant. Don't wake it up before plying! Instead, keep a fresh ply-back from when the singles were spun to guide plying twist and realize that the dormant twist will show up when you wet-finish your skein after plying.
However, I would really like more specific advice. Some authors talk about counting treadles - clearly not spindle spinners!
What follows is from an old Ravelry post of mine:
"Mabel Ross’s theory, in Essentials of Yarn Design, is that ply twist is 2/3 singles’ twist. So, your final yarn has 8 TPI [twists per inch] in the 2-ply and each single has 4 TPI remaining in it. But why would two, skinnier, 4 TPI singles “balance” with an 8 TPI 2-ply? I know, 4 + 4 = 8, but does that hold true here, isn’t it more like 4 and 4 in parallel, not in series, pulling against 8? Clearly I’m thinking about this too hard, muddying my ability to understand what I’ve always taken as fact in my desire to get at its underpinnings.
"Alden Amos’s theory, in The Alden Amos Big Book of Handspinning, states that ply twist is 1/2 singles’ twist. I read that 10 times last night trying to figure out what he meant. Does he mean, once it’s plied, that your 2.5 TPI 2-ply has singles that each still contain 5 TPI? or that your 2.5 TPI 2-ply has singles that when not plied were 5 TPI? And do either of those things match up to Mabel Ross’s statements?
"Anne Fields (Spinning Wool: Beyond the Basics) quotes Mabel Ross, so she’s taking her numbers as a given. And Peter Teal (Wool Combing and Spinning, the original version) doesn’t really discuss balanced yarn, since he wants to be aware of what the twist is in his singles, and he wants there to be a certain amount, so he discusses plying twist in those terms."
End of quote
Well, that didn't really help. Especially the TPI of the single after plying - I want to know how much twist to put in the single and then how much twist I put in the ply.
These days, I do still use the freshly spun ply-back sample as a sample to match to when plying. And rather than TPI, I use twist angle to let me know what type of yarn I'm spinning. Medium knitting yarn wants a 25° angle of twist while durable sock yarn wants a 35-38° angle of twist. This is true no matter what my yarn diameter (WPI, wraps per inch) is.
If I don't have a sample, I can make one by folding a length in half and knotting the ends, being careful not to let any twist come out. Put it in warm water and the dormant twist wriggles the sample up to show what balance is in the 2-ply.
If I have no access to warm water, I can visually inspect the plying. When balanced, the fibers in the singles area straight, and the plied yarn is at maximum diameter. Before it's balanced, the singles are compressed and after the balance point, the plied yarn compresses.
You can find many posts on this blog about balance in plying if you'd like to dive into the topic further.
I may never get to the bottom of the singles-vs-plied twist question - but perhaps someone else will rig up an Alden Amos-style twist counter and then we'll all know. Will it be you?
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© March 30, 2026 by Ask The Bellwether, posted at http://askthebellwether.com/


