Fishing internal cable housing

might want to email Qroo and find out if the inernal housing is supposed to be taken out... most modern bikes allow for it but I am not 100%

I've fished out housing some pretty creative ways before... if it is supposed to come out we'll try to come up with one that'll work for you.

Yeah, I have a dialog going with QR as well. There *should* be housing, because they aren't any stops to maintain tension within the down tube once the cable enters, like on a Felt, Cervelo, etc - so you need the housing with ferrules at both ends (bar end and exit hole to provide the housing with something to stop against. I can't imagine this housing belongs in there permanently though, makes the bike not serviceable. My 'best' idea so far is to drill the exit hole just wide enough to get a clothes hanger in there, but not so wide that the ferrule won't still provide the stop. I know from the piece I did pull out it was compressionless jagwire; the reason it doesn't just slide out is that it's bent into an angle. If I can push it down far enough so it gets past the bend at the bottom bracket, it'll be straight enough slide out the top.

can you still run a cable through it?

If so you can try running a cable through backwards and pulling it out that way. Depending on how small the hole is you might have to shave the head of the cable to allow it in.

Drilling is absolutely last case. I've seen it done before but I'd suggest exhausting all other options first.