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I bought mine a loooooong time ago, but I'm pretty sure they would've come from RS
https://tinyurl.com/y2mrjpvb
Given what you've said, this might not be the tip for you, but if you want them to punch to a consistent depth, use an automatic centre punch rather than a hammer.
Thats fine, rough is part of the charm. I just want to make sure it will be legible and if there are any recommendations of sets to buy