If I were You I'd be way confused. You got myriad of opinions mostly from men with nada background in metalurgy. Those suggesting kasenit for modern hardening steels and drill rod are way off. Man said to harden the pin after getting length set. He should be able to tell you details to harden it. Almost all modern parts are made of air hardening steel with heat treat oven and pyrometer to hold temp for time specified for hardness required for the application. Do it right by getting details and taking the pin to a shop with ht oven. You going to be an alchemist or do it right?
