spring-steel is harder than the touchhole liner and could wear it.
That is about as real a problem as Martians listening to our brain waves. :youcrazy:
There is barely any touching of the pick on a touch hole. Spring steel is just fine. My preference, in fact.
But, a real caution. :shocked2: Never, ever, never use drill rod. Way too brittle. I was once given a very pretty pick with a bone scrimed handle but made with drill rod. Broke just being handled. Now I have the end but no pick.