Sew over thick fabrics
It is easy to get over thick pieces of fabric, especially seams on jeans, by basically using a (denim) needle size 100 or 110 and using a so-called "lifting plate" manufactured by Husqvarna.
Please ask your local dealer / sewing machine area. The plate is used for height compensation: If you sewed while sewing with the presser foot up to the thick place and this "cross" wants to push the lifting plate from behind the raised presser foot. As a result, the presser foot is raised even more - just like a ship in a lock.
Then sew with the now higher positioned presser foot (preferably by hand) (the lifting plate has an opening for this purpose). When you arrive at the end of the thick area and want to sew down from this height again, the lifting plate is pulled backwards and now pushed from the front under the presser foot.
It is further sewn with the lifting plate until the presser foot in its full length has "left" the thick spot and lies back on the originally flat fabric. Then the lifting plate is permanently pulled away to the front, so removed.
Incidentally, the lifting plate has two differently thick ends, which can be used depending on the varying thickness of the material. The result is in any case a seam whose stitches over the entire fabric thickening are very handsome!
