Ramp Assist Springs, HINGE MOUNT for 3/4" OD Shaft- each spring sold separatelyRamp Assist Springs, HINGE MOUNT for 3 4" OD Shaft Choose Left Hand or Right Hand: These heavy duty ramp assist springs are designed to fit onto the ramp hinge shaft (the round horizontal bar that holds the ramp to the trailer body). They can become slack with age & need replacement. These springs will fit on a 3 4" diameter shaft. They are made slightly larger, because they will get smaller when torque is applied. When you are standing behind the