Go to: http://www.harpermfg.com/hm_stamppresses.html
They sell the machine and also can do pre-stamped tags for you.
However, the press that they sell takes the guesswork out of
centering your logo stamp on a tag. I haven’t purchased their
set-up; but a friend of mine did and she is very pleased with it. I
bought a stamp tool that I have to hammer myself, like you. Hope