All right, I'll admit it: this document is a little specialised.
A recessed lensboard allows a large format camera to use short
focal length lenses which would otherwise not be able to focus
at infinity due to the minimum extension of the bellows. The
Linhof Technika recessed lensboard is supplied with a mechanism
to permit a cable release to operate the shutter, whose own
cable socket is buried within the recess, but with
no instructions on how to install it. This
document walks you step by step through the installation of
a Schneider Super Angulon 47mm lens on the recessed
lensboard, and explains how the curious collection of
parts supplied with the lensboard are assembled to
operate the shutter.