You can't do it without a speed controller. The different diameter of the string vs belt will result in a major speed difference.
Here's a link to an on-line vendor for inexpensive silk thread in any color you may want. I recommend size or 3.
Griffin Silk Bead Cord. Link below for online supply:
http://www.artbeads.com/stringing-materials-griffin-silk-bead-cord.html
Here's a link to an on-line vendor for inexpensive silk thread in any color you may want. I recommend size or 3.
Griffin Silk Bead Cord. Link below for online supply:
http://www.artbeads.com/stringing-materials-griffin-silk-bead-cord.html