I can tell you, Anne, that the word "Whoa!" does not work to stop the sewing machine. You have to push that start stop button, or the foot petal. I have had personal experience on that one. Sorry your knee is giving you so much trouble, but it sounds like there is a 'fix' for the problem. Doctors can do wonders anymore in replacing knees, according to the people I have talked to that has gone through it themselves. However, with muscle problems, if it just that with me, I will have to suffer along for quite a while. At least, no one today shoots an old mare that goes lame.
Discarded the MB started on yesterday. Chose a different pattern for the MB, when I get the time to work on it. Every keep cool (or warm Anael) and celebrate the day!!