Mal Davies loves an excuse to aim his battery-powered drill at something! Many thanks Mal for your assistance.

The new wheels are huge - double the size of the old ones, and nylon, not rubber.

The wheels with a green lock incorporate both a parking lock and a directional lock but it is easier to wheel the trolley without using the directional lock.

A faint picture but that is Mal's shoe toe pushing down the parking lock for the rear wheels.