Hermione
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its surely will wear off...
because of friction...but that is true for every thing....on earth..be it Tyre..machine pats, your key board.....
but because it will wear off we should not sit effortless.....
btw you can see the grooves on the cylinder in 1st image ...so the the drum roll on it and educes friction and hence wear off....
That is the whole point. People do not spend money and resources mending these contraptions in rural area. What fixes and maintenance are needed for pots carried on the head? People do that in the first place because it is cheap and efficient. If they wanted to invest in a water carrying device, there there are cycles everywhere on which cans are hung and gotten home in double swift time.
See this....it solves that issue too
"the WaterWheel is made from high-quality plastic that can withstand rough terrain. "
It will survive for sometime.And i am sure soon we'll find more such products in the market now.And those might be more durable ones.
The wheel may well last for eternity, will the handle last?