Replaced nipples and hub ends on Nomu Lab Wheel #4

Today it's wheels again (abbreviated from here on)—this isn't really related to that, so I probably shouldn't be posting it here,
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but I received a rear wheel from a customer for the Nomu Lab Wheel #4.
There were some nipples with cracks in them,
so I decided to replace them all—the image above is already after the work.

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I loosened all the nipples thoroughly and replaced them one by one with new ones,
so it's essentially wheel building, but like the rim migration I mentioned before,
according to my own arbitrary rules,
today doesn't meet the criteria for wheels (abbreviated).
I've already built a wheel in the previous post today,
and separately I'm building another one as well (next post).

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Regardless of whether there were cracks, when I loosened the nipples,
galvanic corrosion rust came pouring out,

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and actually I've also replaced both hub ends with new ones,

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The serrated section that's press-fitted was abnormally rusted, and the left end is even cracked.
It's not uncommon for some rust to appear on these serrations,
but they don't usually get this bad.
Given that it's a rear wheel, the only explanations I can think of are either
constant sweat from using a three-roller trainer,
or salt damage,
but since it's a tubular rim, even with a three-roller trainer,
it doesn't seem likely it would be set up as a dedicated roller wheel.

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There were stickers on the hub shell—apparently about three of them come with each Nomu Lab Wheel pair.
As for me, I don't apply these to hubs or rims with my own hands.
You're welcome to put them on a bathroom door handle or umbrella handle instead of the wheel.

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