I need to buy a Vertical tilt lock knob for a DYNEX DX-TRP60. The knob that controls the vertical tilt and locks it in place up to up to 90°. I think the Tripod is no longer made, but if anyone has any left over parts they want to sell, or has an idea of how I could make one. It's fine using it straight or at 90°, but for a fun picture at say 60°, the knob is needed to hold the camera at that vertical angle. Thanks. KW