Because of some ongoing health issues, we may not respond as quickly as we have in the past - but we WILL respond as soon as we can. Your patience is greatly appreciated and please email us instead of calling. Thank you, Linda at Relics
Authorized reproduction of the users / instruction manual for a Singer model 231-25. It has adjusting information. It is described as a two needle, two looper, two thread, chain stitch, feed off the arm sewing machine.