Sometimes, in the middle of weaving, you realize that you’ve used the wrong color of loop — here’s a simple way to make it a bit easier to swap in a different one.
When I put in my first row, I accidentally used a white loop when it should have been yellow. I only noticed after putting in the rows above and below. Working middle rows is trickier when they are forced atop each other for the 19-peg pattern. So I looped my replacement yellow into the white loop that was there, and threaded it through in its place. Best to work it through one crossing at a time, I find, because the knot is lumpy. Slower, but so much easier on a complicated pattern than taking it out and starting from scratch.