Thanks Fritz,
Jakeemt, thanks for posting a video of your call in action. I get my most realistic yelps from a hard wood striker. My most soft calls I use a very soft wood striker I made from a hardware store dowel. I'm not real sure of the wood I think it's poplar. I use three different strikers for three different hen sounds. I'm Not sure about slate and the woods I described. IMO the striker combo your Ol' man is using would make very beautiful soft purrs. Try out different woods for different sounds. You will be surprised at all the racket that deep short she'll can make with different woods good luck to you and your Ol' man.