Weight Weenies

hi,
i bought Deda superzero carbon handlebar.
and i'd like to apply bar-end juction on this handlebar.
in the introduction, this handlebar can be applied

internal cable routing; compatible with campagnolo epS / Shimano Di2 cable routing.

but it does not mean barend juction ok.;;;

So, i reviewed some blog how to applied in this case. but all of them are drilled on alloy handlebar.

is it ok for drilling on carbon handle bar??

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I wouldn't.

Are you sure you can't fish the cables thorugh the bars? Zipp SL70 Aero technically are blocked, although with a coat hanger and some patience, I managed to push out the plastic "bag" that's in the drop, making space for the Di2 cable.

I have drilled carbon handle bars so I can run wires from the bar to the stem [to hide the EPS interface inside the stem]. I was concerned when I drilled it and 6 months of riding with them. Since then, I have drilled several more [same handle bar and the same space in the handle bar] and after several years of riding, I have not had a problem.

I have not drilled in any other spot in a handle bar.

I would never drill, especially in case of a lightweight carbon part. The stresses in the bar are likely to increase and you don't know which safety factor was used product design...

If the manual states that it's compatible you might reach out to Deda and ask for more detailed instructions for application.
Maybe you can use a vacuum cleaner to get the cables through the bar.

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