The monogrammer for low shank machine is Singer #V171278 Deluxe Monogrammer for Vertical Needle Zig Zag Machines. Look on eby. Also look for .
Singer describe these as
Active attachments for Singer sewing machines where the position of the material is controlled by a lever connecting to the needle clamp screw.
also look on ebay for feet for vintage sewing machines. be careful of what you buy, some sellers do not know the difference in feet shank. good luck let me know if you need more help. I look a lot before I found mine.