The button in the center says stretch stitch. The little push button you push for zig zag or no zig zag. I am finding out more. The gears are all metal and the machine its self is. I will update when I find anything else. If anyone else has anything on it please let me know. I am probably just going to sell it. I have all singer machines. My sewing room is to small. I have 4 other machines and three of them are in cabinets and then a long sewing table. Not enough room. Thanks for all your help.