Fit a castor wheel to the end of the gate so that the weight is on the castor and not exerting a force on the top hinge pin. One source is https://www.blickle.co.uk/
It is illegal to hang urchins upside down
bent by urchins swinging on it and you might be able to bend it back. Or, if they are fully symmetrical, hang then upside down.
It is illegal to hang urchins upside down