slk350

Haven't been on here much because of a bunch of stuff going on....Anyways I do alterations and a lot of non-quilting sewing all the time. Just wondering if anyone else has these problems with a HV Topaz. 1. When "trying" to sew with a heavy top stitching thread, the top stitch looks fine, but the bobbin thread has these huge loops...anyone know how to adjust the machine ??? 2. When sewing on a stretchy fabric ( yoga or workout pants, spandex type of fabric ) the machine skips stitches all the time. I use a needle for stretch fabric and set the machine on the stretch setting. Any advice out there ?? Thanks