What feature pioneered by Halladay drastically reduced the maintenance burden on remote windmill systems?

Answer

A self-oiling mechanism for the bearings

Halladay introduced a self-oiling mechanism which drastically cut down on the maintenance required for the bearings, meaning fewer trips were needed to grease the machinery standing dozens of feet high on the prairie.

What feature pioneered by Halladay drastically reduced the maintenance burden on remote windmill systems?
inventorAmericawindmill