The NTR QuickStart guide:
http://wpc.660d.edgecastcdn.net/8066...quickstart.pdf
The section on the travel screw isn't exactly about storage, but I would assume that travel = storage to some extent.
"The travel screw supplied will secure the ribbon element
in place during transportation. This must be installed
when transporting or moving the microphone,
and must be removed when recording.
To remove, secure the microphone in an UPRIGHT position.
Carefully unscrew the travel screw, removing it
from the microphone completely. Store the screw in a
secure location when not installed in the microphone.
To install, secure the microphone in an UPRIGHT position.
Carefully screw the travel screw into the microphone
top, taking care not to over-tighten."