Super lock, you can recommend

Very easily movable joints, therefore can also be easily folded up and is not difficult.
The previous model had my husband in use, or have dissolved over time the numbers.
He could exchange it at the time and got the lite model. I really hope that keeping the numbers long, in this model, but time will tell. Incidentally, the Lite model is not much easier than this, and the joints are harder to bewegen.Deshalb I think this is the better choice.