whenever I have to take out a seam, it is usually already on the longarm. I use a tweezer and lift the top thread so that right at the junction of the fabric and where the top thread is pulled upwards, I can see the bobbin thread. I use the seam ripper to slice that while pulling on the needle thread at the same time, this usually removes 10-15 stitches quickly. It has saved me load of time and I learned if from a longarm quilting video.
Michelle G.
El Paso, Texas