I didn't realize how late it is, but I'll respond to this without reading all of the posts. When I did my first D9P, I didn't know how I would SID. The only other thing I can do on the domestic machine is cross-hatch. So someone advised me to take a long straight object (I used a narrow slat of wood bought at Lowe's.), place it corner to corner diagonally and mark it. I did that and then stitched along the marking. Then I proceeded to do the same for the other direction....place the slat of wood corner to corner and mark, then stitch along the marking. Next I started with one of the diagonally lines and used my 5" x 24" ruler and marked with that all the way parallel with the stitched diagonal line. I continued to do the same going all the way across. Then I did the same with the other diagonal line. This probably sounds so lame, but it came out very nice. I suppose you could use any width of ruler, depending on how far apart you want your stitching to be.