HELP! I have 3 zips to replace and my patcher is playing up. I don't have a manual or problem solving info. Just doesn't seem to want to stitch. Messed about with the tension and thought it was ok, then realised all the thread had gathered in a ball under the material. Have tried different needles etc. sometimes its doing 1 or 2 stitches then missing loads or just not catching a stitch at all. Any info would be great.
CHEERS