Do you mean a Valve?
An old push rod is put through and tapped removes them nicely if they move or a small shape chisel to split them. Carefully
I can't imagine a pushrod would work??
An old push dos I use one from an old landrover I think is was (longer). Ball head one end and a funnel shape the other I put this end on the edge of the race and tap/hit the ball end worked wonders on all of mine and no marking or scoring at all. I will tri and get a picture when I'm back at the garage.