
1) Architectural element
Found on
https://www.crosswordclues.com/clue/windshaft

The Windshaft carries the Sails and also the Brake Wheel (Smock and Tower mills, and in some Post mills) or the Head Wheel and Tail Wheel in a Post Mill. Windshafts can be wholly made of wood, or wood with a cast iron Poll End (where the Sails are mounted) or entirely of cast iron.
Found on
http://en.wikipedia.org/wiki/Glossary_of_mill_machinery

The windshaft is a part in a wind mill that carries the sails and also the brake wheel (Smock and Tower mills, and in some Post mills) or the head wheel and tail wheel in a Post Mill. Windshafts can be wholly made of wood, or wood with a cast iron poll end (upon where the sails are mounted) or entirely of cast iron. ...
Found on
http://en.wikipedia.org/wiki/Windshaft

A cast iron WindshaftThe Windshaft carries the Sails and also the Brake Wheel (Smock and Tower mills, and in some Post mills) or the Head Wheel and Tail Wheel in a Post Mill. Windshafts can be wholly made of wood, or wood with a cast iron Poll End (where the Sails are mounted} or entirely of cast iron.
Found on
http://www.translationdirectory.com/glossaries/glossary254.php
No exact match found.