Mechanical things don't usually work for 100 years with no maintenance. Bearings run dry, if nothing else.

Air bearings always run dry without problems.

	▲	yetihehe 16 hours ago \| parent \| next [-]
		Air bearings run dry until they get some moisture. Then they fail. Old joke about making radio enclosures: make it as watertight as possible, then drill a small hole on the bottom to let the water escape.
	▲	contingencies a day ago \| parent \| prev [-]
		Until they are replaced with dust, pollution, hair, animals, leaf litter, aggressive plants, seismic events, pollen, skin particles, birdshit, fallen logs, slime mold, etc.