Bob Purcell's most recent Superior Threads newsletter says it's no longer true that top and bottom thread need to be the same weight.
I usually use Bottom Line top and bobbin on my Bernina
My Jems won't take it for the top thread when it's in the bobbin, so I use Aurifil cotton 50 or Mettler cotton 50 or 60.
Last edited by gollytwo; 01-14-2012 at 10:40 AM.