Did consider that, MCB - however no mention of this chuck model on their Instructions webpage and couldn't find an email address to ask their Support people. Thanks for the advice though.
However, since posting this item, I ran a search of the previous postings on this forum and found an earlier request for the manual dated some years ago.
On that occasion, the Bowler Hatted Turner came to the assistance of the poster by providing a scan of the manual.
If BHT reads this post, would it be too presumptious of me to ask for a copy of the scan that he provided at that time.
Derring