Hi there folks ,im always trying to do the impossible ,to my own frustration most of the times ,but this idea came to me after many thoughts of what i can use as a unique touchmark ,so i thought what if i can use my own thumb print?as a touchmark (Not sure if this can be possible) so the only ppl clever enough to help me find a way ,if there is ,is here on iforgeiron .What about casting it ? Was my first thought ,and in what type of steel ? Melting sping steel maybe ? Any help would be appreciated,maybe there are other ways like machining or lasers that I didn't think of ,cant wait to hear from you ,cheers from South Africa