Any tips for an absolute novice about to throw her newly acquired treadle out the window if I don't get this tension right? I have had to take the top tension unit apart to replace the take up spring and clean a gazillion years of gunk off everything, and likewise the shuttle tension screw and spring. Now, I'm pretty sure I've got everyone back home where they belong but man.....I just cannot get the tension right! Here's a picture of my top stitching...it doesn't matter how much I loosen the top tension, I still get the funny little corners happening. Am heading for the red wine as we speak!