As the others said, that was not a great idea when new, and now with parts from "The Land of Almost Right" it's nearly a hopeless cause.
Best you can you is look for a new old stock genuine Delco switch, there's usually some on fleabay. I shop there for NOS points, condensers, caps, and rotors, as well.
As a workaround to use what you have IF the starter stud is not too badly eaten away, it works to slot the mounting screw holes in the useless starter switch a little to move it in the direction of the "drive end" casting, this works to make the copper contact plate contact the stud in the starter "belly" sooner and harder.
I've done this several times, with success.
There may be an interferance issue if the rough cast edge of the "snout" flange is in the way of the repositioned switch sitting down again the starter "belly", that can easily be taken care of with a grinder.
Also, if the stud in the new switch is held in place with a nut (rather than being crimped in place as some of the new JUNK is) you can take the stud out of the switch and add a washer with a small O.D. that fits the stud between the stud and the switch body, moving the contact area on the stud slightly towards the copper contact plate.
Be sure to keep the insulating washers and sleeve in place so the stud doesn't short to the (grounded) switch body.
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