I am not familiar with modern machines, but I think that most needle screws are on the right side. I have printed out some diagrams for which direction the flat goes, but forgot about it when I went to insert the needle on my Singer 15-30. I used a mirror. Actually, it was a good thing as I didn't have the 15-30 listed and other 15 models the flat goes the other direction. Sometimes you can tell by where the last thread guide is located. Looking again at this site, you may be able to tell by where the slot for the needle is located above the needle clamp as indicated on
http://www.sew2go.com/needleset.htm Granted those are for Singer sewing machines, but maybe it would be the same for your machine. By the way, what is the machine????