I have a new to me Adler 267-373, and let me preface this question with the fact that I know next to nothing about sewing machines.) I’ve looked at numerous diagrams and pictures online and I’m fairly confident that I have the machine threaded right. I cannot seem to get my stitch knot to sink into the leather. I have a very minor grasp as to how to adjust tension, but have not seen any change in the stitches when I do make adjustments. Also, when making these adjustments, my thread wants to get jammed up and then throws my timing off, forcing me to constantly reset it. It says my pictuare too large to upload but I’ll keep playing with that.