The Ravelli APGL5 is a Professional Quality Tripod that provides a solid base for high-end photographic equipment. This model is made from Aluminum to create a light weight and sturdy tripod. The ball head provides smooth adjustments to any angle. The center column is gearless and the legs can be inverted for low angle shots. Dual foam grips, quick release leg locks, one Quick Release Camera Plate and rubber feet complete a very nice light weight tripod. To trouble shoot the APGL5 Legs, You need to unscrew the collar on the top of the Blue twist lock. Then you un screw the blue twist lock completely. This allows you to remove the inner leg from the outer. Most times when the leg gets stuck it is because it was opened to fast and the Tab that hold the leg from twisting is now stuck. So there will be 2 tabs inside the leg, just re insert these into the 2 holes on the inner leg and then put back together.