You make a handle to hold the lettering. you can only do one line at a time
though. Just mill a slot in some steel stock so the numbers/letters fit in
sideways. then cut it to width put a couple of pieces on the sides and a
setscrew in one side to hold the letters/numbers tight. then you can stamp a
whole row at once. you can buy stamp holders for about 60.00 too. the letters
and numbers for them get spendy.
http://www.knight-toolworks.com/web_...toolholder.jpg
I have several for 2 numbers and for dates and such. I have been getting the
letters and numbers from msc but at 2.00 each they do add up.

--
Knight-Toolworks & Custom Planes
Custom made wooden planes at reasonable prices
See http://www.knight-toolworks.com For prices and ordering instructions.