We recently set this up and it works well. You get a metal ring around an inch (2.5mm) or so and put the ring on the snuffer line below the bottom grommet.

I was told the pigtail is around 18 inches in length, we started with ours a little longer around 28 linches.

One end of the pignail attaches to the ring, the other end to the clew. When the spin is snuffed the sheets are fairly tight.