The threated one you made looks like the commercial ones you can buy.
I have a collegue at work who uses one. He needs to hardstamp a lot (goes thru a couple of hardstamps yearly on mostly brass and steel plates) and since a workrelated accident (after stamping several plates with his proofmark and certificatenumber, he was tired and hit his thumb. The thumb was broken) his department made them mandatory.
But those are some sort of plastic. Good for weight, can handle the hits, but in our application probably useless, because heatresistance will not be good.