Henk Boelmans Kranenburg,  I know there were several different styles,
especially as they moved from the original Celestina to the "Improved
Celestina".  But on the model I have, the crank handle is simply
unscrewed, and the pillow block bearings inside are removed to release
the shaft.  The shaft can then be removed to the inside of the case.

Todd Augsburger - Roller Organs
www.rollerorgans.com