http://usera.imagecave.com/lysanderxiii/oiling.jpg
Type: Posts; User: lysanderxiii
http://usera.imagecave.com/lysanderxiii/oiling.jpg
Grease and oil reduce friction, they do not eliminate it altogether.
A threaded fastener stays in place because the force due to sliding friction exceeds the forces trying to rotate it. Given the...
http://kant1.chch.ox.ac.uk/images/watchmaking/tweezer_bad_16Mar2008.jpg
These can be fixed by taking a piece of rather course sandpaper an folding it half, so there is grit in contact with both...