1. the longer arrows represent the positioning of the power stretcher. Installers butt the tail of the power stretcher up against the wall nearest the tail of each long arrow. The head of the power stretcher is positioned where the heads of the long arrows appear.

2. the shorter arrows represent the positioning of the knee kicker. Notice how it is only used to stretch the last few feet of carpet. Guys who use it to stretch in the whole room blow out their knees and cause you premature wrinkles.