I bought a tripod at K-Mart 50+ years ago. It had twisting leg locks. A year or so ago on a visit to Best Buy, I spent $27 on a new tripod, and gave to old tripod to a friend. The new one has flip locks, and I find them handier. It may not be good for 50 years, though. If I'm still taking pictures in my 90s, maybe I can afford a new tripod, especially if I get a t-s lens by then.