lol I have also heard they dont budge, they are really hard stuff. I think its just hardened steel of some sort, probably 4041 I think it is.
I have been thinking of making a bunch of them and selling them, but I have been really busy with a real machine shop, its hard to come home to my mini machine shop and work after 9hrs of it
after I finish what Im doing, maybe Ill write a program and make a batch.
Jon