The Lifting Pole
While the cover is still on the ground place the fourth pole (lifting pole) under the cover, leaving the same overhang as the other three major poles
Tie the lifting pole to the tongue at the top of the cover. Tie the straps tightly around the pole, making sure that they are extremely firm.
At this point, the Wedgie as we named the piece of wood that is shaped like a wedge, is hammered between the tongue and the pole. this will definitely keep the cover from slipping down the pole.