Making a Simple Marking Gauge

In my quest to become more proficient with hand tools I decided to make myself a marking gauge.  Want to see how I did it?

I was pretty simple.  The reference surface is just a piece of walnut I turned on my lathe.  The shaft is a piece of 3/8″ round bar and I simply used a thumb screw to secure it in place on the shaft.  The cutter is a 15mm round carbide cutter I purchased from Easy Wood Tools.