Installing a knife hinge can be extremely difficult because of the small amount of margin for error allowed. If the plane of the hinge is slightly askew, then the hinge will not function smoothly. Some manufacturers incorporate a slot screw hole so that minor adjustments can be made to compensate the door’s hang, but the hinge itself is so basic that its two pieces are not very tolerant of misalignment. Some models have full swing capabilities, while others incorporate a stopper. All manufacturers produce both left and right side hinges in this style.