K&M SP 03-11-310-25

.. , long overlooked by philosophers, poets, and interstellar hitchhikers alike, is in fact one of the more important inventions in the universe—just slightly less useful than the towel and considerably cheaper than a Pan Galactic Gargle Blaster.
This particular washer—DIN 125, no less—is a small, round marvel of German engineering. Its primary purpose, as the Guide would solemnly note, is “to prevent nuts and bolts from chewing through whatever they are bolted to, which is generally considered a bad thing.” In this respect, the K&M SP 03-11-310-25 delivers a flawless performance. It sits there. It washes nothing. And it makes the bolt look like it knows what it’s doing.
The price is so satisfyingly low that one suspects it may have been engineered by a committee of Vogons trying to discourage sensible consumer behavior. Naturally, I bought more things I didn’t need to avoid paying postage—thus achieving the true cosmic purpose of the washer: serving as a gateway drug to further unnecessary purchases.
Would I recommend it? Absolutely. If you’ve ever stared at a bolt and thought, “You look lonely,” this washer will provide it with companionship of the most steadfast and circular variety.