Moving windlass:

WARNING: This page does not describe the selected car, but rather 16 other vehicles, including the 2006 BMW 330Ci, 2005 BMW 330xi, 2005 BMW 330i, 2005 BMW 330Ci, and 2004 BMW 330xi. However, it is still accessible from the selected car via links, so may be relevant.

Before moving windlass, remove reversible ratchet, extension and parabolic tool
Release sucker on windlass
Pull and hold black locking button (1)
Turn windlass and move with sucker
Refit reversible ratchet, parabolic tool and if necessary extension
When cutting the corner points, make sure the wire is situated in the guide channel of the windlass; this makes the cutting job easier

Fig 1: Moving Windlass
Courtesy of BMW OF NORTH AMERICA, INC.