I was asked if I had any helpful hints for using monofiliment thread on a longarm quilting machine. Mono for short. Here are my thoughts. There are two colors of mono thread. A clear and a smoke. I use the smoke on dark fabrics and the clear on light fabrics. If you use the clear on dark colors it casts a sheen making it appear when it should be almost invisible. I often call it invisible thread to my customers. Using the smoke color on light color fabrics makes it look like you used grey thread.
Mono thread has what I call "spring back" effect. Meaning it stretches, until it can't any more, then it breaks and springs back. Sort of like pulling a rubber band way to tight and it breaks. I use the small spool adaptors on my Gammill and leave the mono thread on the machine all the time. I have two adaptors, one for clear and one for smoke. I happen to be out of the clear right now so that holder is empty.
The spool, when on the adaptor, shouldn't have any tension on it what-so-ever. The spool should spin freely. The adaptor should be angled so the thread doesn't come off the spool and get caught. Hmm... hard to describe but sometimes it rolls off the small end and winds around the white holder part.