|A much easier technique for threading looppers on sergers than forming a loop from sewing thread (ever tried to put such a loop through a looper BACKWARD?) and using it to pull the wooly nylon through the needle or waxing such a loop is this drop-dead easy method:
Make an overhand knot of the looper end of your otherwise-threaded wooly nylon and some plain sewing thread. Cut off all but about 1/2 inch of the ends of the joined threads, being sure not to cut the threaded wooly nylon or the long end of the sewing thread.
Guide the sewing thread through the needle. Use your fingers to put some tension on the wooly nylon behind the sewing thread so that it thins out; pull it through the needle. No heroics, no weeping, no problems.
Works every time, and no contortions are necessary.