Here is a snippet of a random conversation that happened on a talker that I frequent:

Mufasa says: afternoon
Mufasa says: been working at a portable sawmill on a farm all day
Mufasa says: at the cottage now
Mufasa says: oh, and it has been raining all day … we were in a very muddy field
Sam says:
Death says to Mufasa: you sound like you’ll be all set for when my army of Nano bots
tear through the planets technology base, leaving me a techno-overlord of the neo-dark ages
Mufasa says: well, the operation of the sawmill did require a tractor to drive the huge
circular-saw blade
Death says: well I’m targetting the nano bots at somewhere in the low-middle range of
the combustion-engine level of technology, so an old tractor would probably be workable
Death says: at least until phase 2
Mufasa says: to do this job correctly the saw blade would be driven by a water wheel
Death says: that should be fine, though you’ll have to source low-tech lubricants for the axle
Mufasa says: butter