Thank you to Gail and Doedo Schipper who have taken the time to digitize the CASA 1131 assmebly/parts manual.
Registered website users can click this link to download the book:
It is quite a large download, but well worth it. While Bucker Prado SA were active in supplying Bucker parts, they would use this book as a guide. The page shown above is page 4/41 so a part would be identified by that page number and then the item number from the drawing. Still a good way to define a particular component.