I had seen the info you are talking about & they used masking tape to mark the machine & guided the points of the squares along the tape. I can't find it either but it seems like you would mark your machine with tape 1/4" away from your needle position & guide the points your squares along the tape line. So your points would be guided along the lines & your stitching would be 1/4" away from the points on either side. I hope that made sense!