Keihin Brass Tubes

I have Keihin CV34 carbs on my 81 LTD 750. While fixing a crack in one of the float bowl brass tubes, I broke it. I'd like to replace the tube and meaured it at.175 diameter. I imagine its just drilling out the old one and replacing it. Anyone done this before? How about a source where I can buy .175 brass tubing?
Thanks
Nick

I broke an overflow tube in the float bowl on a set of kehins on my wife's cb400t, the brass tube was just pressed into the float bowl. I used a small tap that fit inside the id of the tube, once I screwed the tap in I pulled out the broken end piece. I was lucky enough to have the tube break off right at the bottom so I was able to put the tube back in the hole. Once the carbs were rebuilt and back on there was no leaking from the overflow, there was enough length left on the tube. 2 years later and no leaks, if I had to replace a tube I'd start at a model railway hobby shop. They have lots of tiny round, square, angle stock in brass, aluminum and stainless.

Small brass tubing comes in standard and metric sizes, but the metric stuff is harder to find.

Maybe a hobby store would have it, I've seen small diameter tubing there

I was visiting family in Maine today and checked a local hardware store. Turns out they had a bunch of small brass tubing stock. I bought a couple of 1/8 diam that should work. The measurement I had was actually .125 instead of the .175 I originally posted. Thanks guys.
Nick