Curiously, this fragment crystallized as an open ring, like a lock washer, whereas the biologically active form of the helicase more closely resembles a flat washer.
From the sciencedaily.com
Often quite simple changes can dramatically improve product service, such as changing to mold-resistant paint or adding lock-washer placement to the training for new assembly personnel.
From the en.wikipedia.org
Insert faucet with a washer on it into the barrel and secure with a washer and lock nut from the inside.
From the stltoday.com
The washer will lock the car up when they're done.
From the techcrunch.com
The casters were easy to put on, and because they lock, it's not a problem with the vibration of the washer.