I used a wooden mallet. I can turn them out on the lathe out of anything. I like the idea of a square spike to prevent spinning. Thanks for all the good tips.
I am relatively new to this but this is a tool I was proud off. It's a hot cut that is spiked on the end; instead of fitting into a hardy hole (I use a "railroad track anvil", no hardy) it is driven down into the stump.