How to build Montessori Pincer & Palmer Grasp Cylinders? Answered

Does anyone have a good idea for how one would build Montessori Pincer & Palmer Grasp Cylinders?

The basic block and cylinder seem pretty straight forward:

1. Get some large dowel for the cylinders
2. Get/cut some blocks that are slightly larger than the diameter of the dowel
3. Drill the holes with a forstner bit

But how about the little knob on the pincer cylinder? I don't have a lathe so couldn't shape a single piece of dowel.

I'm thinking of shaping the top from a bit of dowel by hand with a small hole and then gluing that to another.