Knot Knecessarily Known Knitting

I gave the direction to use a bridge to create a thumb gusset. As this is an unusual maneuver, I thought I should explain. In a top-down mitt, you cast-on in the round and work a tube. At some point, you may want to create a thumb gusset without breaking the yarn. You can do that by casting on more stitches, joining them back to the main tube, then continuing in the round. For reversible lace, I use a waste yarn tab to mimic the tubular cast-on and bind-off I've used elsewhere in the project. Knit across the tab, turn, yarn over and slip one purlwise with yarn in front for the first pair, then work alternating knit 1 in the running thread, slip 1 purlwise with yarn in front across the tab. After that, turn and work 1×1 ribbing across the tab. Now that the tab is established, join to the body of the mitt using a crochet hook to work the last knit-purl pair on the body a second time. This produces a secure join that won't gap. At that point, I can return to working...