before there were one hand opening tactical knives, many old timers use to use different knives and techniques to help them open their edc knife or defense knife with one hand . what was your knife or technique? my fatheres knife was an old case xx hawkbill used for last minute self defense while in the navy. my grandfather hasd an old congress patterned knife with a toothpick under the blade to help opening. please post pics if you have them.