That Old Crank is a Note in Deathloop .
Location
Found on a desk, under a Crank Wheel , in The Complex 's Green Laboratory Annex . Available at Morning and Noon.
Transcript
Dear researchers,
Tempting as the curiosity may be, do NOT handle this crank or otherwise access the containment chamber. The residuum generated within disperses quickly, even when stored in an adequate container.
I or someone very like me will be along shortly after noon to secure the material for expedient transport to the refinement facility at my lab.
Regards, Dr. Wenjie Evans
Colt Note
Wenjie wants nobody touching her crank, which will open the Residuum containment in the Control Chamber .