UMBA has some dvd's featuring clifton ralph. Whoever fills the orders is on top of things. Get the ones with Ralph Sproul as well. He has some work flow ideas that will make your closet, I mean workshop, seem big.
Back on topic, both my anyang and striker hammers have the "die locating slot". Works with a round hole in the block and a tee shaped pin. I'll try to get photo's.
Back off topic-
"I was born in the back seat of a Yellow Cab in a hospital loading zone and with the meter still running. I emerged needing a shave and shouted 'Time Square, and step on it!'"
-t waits