During the VN era, there wasn't much out there in the way of lock blade folders. I always carried a Buck which I found on the drop zone after my first jump in-country. I had a village black smith solder a brass lanyard ring on the butt and always had the knife attached to me. Now days there are lots and lots of tactical style folders to choose from. My Buck folding hunter eventually broke at the point where the lever fit into the blade, making me want a better, more foolproof system. The balisong design certainly fits the bill, but I don't like having to go through all those gymnastics to open the blade one-handed. My favorite is the liner lock, which I first ran across on the military issue TL29. (It locked open the screwdriver.) I especially like the designs that are railroad-engineered such as the one from that South African guy (whose name I can't recall) where a portion of the whole frame acts as the lock. Some of the designs out there are too complicated and have too may small parts. Any one have any thoughts on this or seen any clever designs?