Here is a widget I made to guide the thread from the big serger spools to the sewing machine. Works pretty good too. This is Mr. Lucky modeling it for us. My wife doesn't use her serger much and all that thread is just sitting there. Soooooooo, I figured out how to use it.
I took a piece of 3/8" dowel rod and drilled it out so it would fit down over the spool pin. Then drilled two smaller holes for the legs of a close pin spring and viola, a thread guide. Works beautifully too. Right now I have this set up on my #2 Singer 66 Treadle for sewing a quilt. Joe