|Woolly nylon makes for some lovely rolled hems, but it's beast to thread into the looper. Here's an easier way to deal with it.
Tie it on to regular thread! While you can do this if you are using the tie-on method of re-threading the entire serger, I hadn't thought about it when I put it in for a project recently. I cut a length of regular thread and tied it to the end - same effect and it was a whole lot easier to deal with.