If the proper slot doesn't fit over the compressed area of the sleeve after swaging then your tool is out of adjustment & your cable assembly will not hold the rated breaking strength of the cable which should be the result when oval sleeves are used to form a loop or eye in a cable assembly.
GA-1P: Gauges all swages performed on 1/32", 3/64", 1/16" 3/32", 1/8", 5/32", and 3/16" oval and stop sleeves.
