I don't want to sound snotty,so please take it as intended. If you a quilter, why would you buy this machine and try to make it do what it may have not been designed to do? It may have a great reputation, but for what purpose?
Left homing machines are great for 5/8 seam allowances used in sewing of clothing and home décor. Let the poor guy or gal be and get another machine that will work for you. Lots of Japanese made machines used Singer's design and added drop feed and LMR needle positions. Check them out and you will be pleased. Many are straight stitch only, which is great for quilters. If you need zz, get a machine which also has a straight stitch plate, as Jean mentioned.