What is Reddit's opinion of2-at-a-Time Socks: Revealed Inside. . . The Secret of Knitting Two at Once on One Circular Needle; Works for any Sock Pattern!?
The tutorial in the front of Melissa Morgan-Oakes' book 2-at-a-Time Socks is great! It's how I learned, and it's done in worsted weight and toddler size. There are other patterns in the book for all sizes, from babies to giant dudesocks.
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2-at-a-Time Socks: Revealed...