Regarding the HST blocks demo., I forgot to tell y'all 2 things: use a small stitch length and, since it is sewing the strips on the bias, I normally sew on paper. (I forgot to do that in that little demo.) For that, I use adding machine paper, which tears off easily; printer paper will work well, but, in addition to the small stitch length, you must crease the paper well before you remove it, so as to not pull stitches awry.