That was one of hid custom hammers. To set the trigger lighter you filed the front half till you get the desired pull weight . It held very securely and was very hard to make follow . The card is from his original shop that was in his basement. A delivery truck knocked down a big branch from a neighbors tree and the debacle that followed the twp mad him stop working from his house so they moved to Mammoth Junction NJ Next to Princeton. Having enough with the NJ anti gun lobby and harassment he moved to Pipersville PA. That is where he remained till his passing. Austin was a Brilliant mind and I wish I knew what he forgot . He taught me a lot and I was lucky to hear many of his stories. Thanks for a blast from my pass. J.Michael