I ended up buying a second machine out of necessity, in the middle of a nightmarish project that I had committed to finish for someone else. I'm actually glad I bought it. It's a used Pfaff (could never afford a new one), that's really heavy-duty with the extra gadget that helps feed the fabric from the top as well as the bottom. At the end of this project that involved heavy duty materials, I ended up with both machines needing a tune up. The guy at the shop recommended that I keep two bobbins from now on, one regular and one for heavy duty materials. He told me to never try adjusting them myself.