I did use the Superior brand MonoPoly as I was told it will not melt like the nylon type. It comes on a medium size spool. I didn't really have trouble with it wanting to unspool until after I had used it several times. I have never heard of a "net cover" for thread. Is that a home style remedy or a product I can purchase at Jo-Ann's?? Also, why do you skip the last thread guide before the needle? What does this do?