Men, materials and tools are smoothly raised with positive action foot pedal and easily lowered by turning a crank.
Pump jack operates on your "upright" (post unit) made of two straight 2 x 4's.
Uprights can be on uneven ground and in narrow spaces. Make sure, however, that ground is firm.
For added safety, place 2 x 8 x 8" plate under post. Plate should be toe-nailed to upright.
System will allow adjustment to a variety of corners, angles and placements up to 30' in height and creates a 24" standing platform.