You can make your own snars out of spectra fishing
line, 80 lb test works well. You can also make your own using wire. Coat hangers, though not the painted ones, the paint
will chip off and than snag the yarns, for the larger sizes down to 0.030" for the small stuff like 1.7 mm spectra. A 1/4" thimble on one end makes it easy to hold onto or to hook onto something and pull down on it. While Brian's design is very elegant, you really don't even need the tube. The bent over wire will slide right along, seldom snagging on yarns.