This is an amazing manual that covers literally everything you need to know about the fantastic array of macro options for 6000 and Hy6 Rolleiflex cameras.
A short list of what is covered:
M39/M40 Behind the lens shutter adapter
Scheider M-Componon Lenses
These documents are completely FREE and available to anyone who wishes. At the moment to receive the download link, you must put this item into your shopping basket and go through the check out process.