Received the needed reference material from my Heywood guru last week so was able to finish the rest of the brake mechanism. Skeleton-view rendering below shows all the components in place. A simple hand-operated mechanism, it proved to be almost wholly ineffective in use requiring a herculean effort to bring the train to a stop. The reconstructed version of the Van has been fitted with air brakes in order to more effectively fulfill its purpose.
As before, drawings were completed in Autodesk Inventor, rendering in Keyshot 3. A larger view is viewable at http://www.roughboy.net/?wpb_portfolio=sir-arthur-heywood-brake-van