One thing to consider... with many of the traditional folder designs, the height of the blade is rather short. This puts your thumb awful close to the edge of the blade while thumbing it open. Similarly, many of the traditional knives do not have finger choils on the blade, and also are limited in your options to close them one handed, i.e. against your leg. It might be worth it to purchase a good quality, but less expensive traditional knife to experiment and see if trying to get a one hand opening version (or modifying it with aftermarket thumbstuds) is really worth it.