Built the rear wheel with a 45mm deep tubeless rim with no spoke holes

Today, more wheel building (and so on).
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Building the rear wheel with a tubeless rim—the kind I built the front wheel with recently—that has no spoke holes (no holes on the outer circumference other than the valve hole).

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Starting the rough assembly this way means the nipples barely rattle around, falling into the rim interior. I'm not doing the "sea urchin state" where you pass all the spokes through the hub flanges, because with this type of rim doing that risks scratching it with the sharp edges of the spoke threads.

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The phase of the hub body peeking through the valve hole—OK!

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Ugh, what a pain.

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These are aluminum nipples, but even if they were brass, they wouldn't be magnetic. That's why we attach this adapter to guide them with a magnet, and in this rough assembly, the adapter passes through every rim hole on the inner side. At shops building complete Campagnolo and Fulcrum wheels, it seems they attach these to all the nipples that correspond to the rim holes first, then pour them into the rim interior.

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Built.

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Revo Disc Hub, 24H, semi-comp 46-spoke JIS lacing. I'll do the rim tape later.

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