Yup! The brass tube does accumulate balsa dots. I was thinking with large tubes, the cut-outs could be used as plys for balsa wheels.

It is a little more time consuming, but it will do the job .

Take a piece of aluminum tubing of the diameter you want. Use a Dremel tool with a cone shaped grinding stone. Use the stone to give the tubing a sharp edge. Simply hold the tubing over the part  and use your hand to push down and rotate the tubing. After making a number of holes you will have to resharpen the edge, but it only takes a few moments to do. 

Maturity? Maybe 28 years. Maybe never. 

I just turned 60...so I get that...

If you notice in the first pic,there is a triangular jewelers file laying next to the brass tube. This is what I used to make the teeth.

I placed the brass tube in my bench vice. I used the point \/ of the file and just filed one side of the brass tube until I got going and then lowered the angle of the file so the point of the file would also begin to cut a tooth directly across the tooth I started.

Then I just rotated 90 degrees and cut two more teeth. Then I subdivided from there. After the teeth were cut, I ran some sand paper around the outer circumference of the brass tube just to clean it up. Seems the teeth don't have to be perfect to cut well.

I should caution that chucking the tubing up in a drill press is probably not the safest thing in the world so you should at least wear safety glasses and the wood underneath the balsa you intend to cut should really also be balsa - something soft. Less torque on the brass tube.

Nice clean cut. I might try that.
Thanks.