Pam, I use Maderia monofilament. It comes on a very large cone, and a stocking over it is a must. It works on my LA as well as my Kenmore and Featherweight. You may have to do a little research on where to get it as I've had mine for awhile. Ordered it online, but can't remember from where. I have also used the Sulky with good luck.
Brenda