What a shame to break the brush socket.

What you really need to do is to educate yourself as to a correct working method for using the pole and flow valve. I keep meaning to do a short video showing how simple and effective it is to use a pole with a flow valve fitted to the pole hose. I may well go ahead and shoot this over the weekend.
Basically the method that I use allows for full instant control of the water at all times with no hunting for a valve. I have the pole hose just before the flow valve running across my right palm. This allows for the valve to be right next to your right hand at all times. With this you can still hold the pole and it allows your right hand to slide along the pole if changing heights whilst holding the pole. When propping the pole up the valve is right by your hand for ease of shut off.
This method really works very well and once mastered is the easiest way of controlling the water. I will shoot that video and post a link.