The shafts look fine from here.
Some driving horses, because of the restrictions of the shafts, need help to learn to turn without being able to bend. It helps to have a person on the ground to assist the horse. This person would take up a position on the offside of the horse, that is, so that the horse is asked to turn away from them. As the whip asks the horse to start the turn, the person assists the horse by pushing on the outside shaft. This helps prevent the horse feeling the shaft too much on the nearside as it turns. This can be done from the halt.
The other thing which helps a green horse to learn how to turn correctly is for the whip to hold (not pull) the horse firmly on the outside rein, to signal to him that he is not required or allowed to go forward to any extent, as the inside rein is lightly taken up to ask for the turn. The weight of the contact on the outside rein should prevent his quarter on that side falling out, and will help keep him straight. With patience and practise, this will encourage the horse to find a way to turn, other than bending, and he will soon learn to step round with his forelegs. This can be practised along with the above, and also from halt.
