Lefse! I go up for the simple reason is that on the down stroke it pulls the string on the down stroke past the rest. If the string is above you get a rolling effect. And I don't think you'll get the same from pulling from the bottom. It's the rolling motion that makes this set-up work the best.I'm not saying that it doesn't work from the bottom ,this is just the way I set mine up and it work's flawlessly.

nubo