First, I think there should be a new category:NOTIONS
I have found only one message from MaryinColorado who suggests that woolly thread should be used only for loopers.
My manual makes no suggestions about threads to use for the needles and the loopers. I appreciate that the threads have necessarily to be thinner than the sewing machine threads to keep the seam from being bulky. I also know from past use that woolly threads are very difficult to use on a sewing machine.
What I would like to know is the range to be used for needles which are compatible also for the loopers, or does it not matter?