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chiroshi
JurekB
This.
In my experience it is incredibly difficult to maintain alignment of the letters - even when using angle-blocks clamped to the workpiece.
Also, you need to keep the stamping pressure equal on each letter.
I found the best way of doing the latter was to punch a dimple into the tail end of the number punch, and then apply the pressure using an automatic centre punch, placed into the dimple and dialled to the pressure you desire/the material dictates.