I just replied to that other thread with my best explanation. I'll add the pic here too. This is my DIY quilt suspension modeled after my incubator. The primary/secondary suspensions both go to the same s-biner. The primary just holds the quilt up high and tight. I it isn't tight enough, then you make the shock cord shorter by tying an overhand knot. The purpose of the secondary suspension is to be able to pull one end tighter and keep it that way. You can also use it to pull the foot box corner tighter to ensure better coverage. The tiny cord simply cinches the draft collar tight.