There is a private company in the UK that makes 3rd party Chuck keys for older discontinued Super Nova 2 Chucks ( these will have New Zealand as the place of manufacture on them)
While we do not support this Chuck key, we do see the need to connect our customers with a possible solution.
Click link below:
https://www.stilesandbates.co.uk/snokey-chuck-key-old-supernova-3021.php
JoeBro