I agree that a good hammer and anvil is key. I use a 3 pound sledge. I had issues with cheap double soded tape as well. Eventually I just duct taped the head to the anvil. 😆 I used the Harbor Freight stamps. They aren't great, but I didn't want to invest in good stamps until I was sure I was even capable. As you can see, the "w" is garbage. WATCH. YOUR. FINGERS!
