Versatile Clamp design for balconies

I need a CAD design of a clamping mechanism that is ergonomic and easy. It should not have too many steps to close, should look sleek and be adjustable to round or square bars of a balcony in order to hold a telescopic pole. It should be a mechanism which can be clamped on and off quickly but still be secure. I have added an example of a prototype i have created which can be explored. Please see how it is holding the pole for better understanding of what I need.