I started off on this thread with 2 Brother ULT's, but yesterday I was using one to embroider quilt blocks --I think they are Harley Davidson bikes (son says they're anatomically correct for colorlines.) I got one mugrug finished and 4.5 blocks done when suddenly the machine gave a death rattle and locked up totally. The hand wheel won't move, tho I have cleaned the bobbin area thoroughly. I think it is off to repair..I'm worried.