Thanks a lot. I think it is a very useful advice, as soon as we put it into practice, I'll let you know if it works. You mean we should push it softer, don't you?
Apart from the little issue with the buttonholes, I would like to say that the Jet Black is a highly recommendable sewing machine. Maybe it is not for "professionals", but a very good machine if you sew at home for "fun". We made a beautiful patchwork to hang it on the wall. ;-)
Miguel, March 2010