Thanks to all.

Jon, I like the hollow tube design for re-igniting the wood.

Doug, the chuck is a 6" Gator 6 Jaw Tru-Adjustable Semi Steel Lathe Chuck that can be trued to within a few 0.0001" using a gage pin. In the full range of the chuck capacity it will be held within 0.0005" TIR. The Gator chucks are made by Fuerda. The chuck designs are clones of the better built Bison chucks but are far less expensive. Also, in one of the photos I am using a Techniks CNC ER32 collet chuck being held within the 6-jaw chuck. This is how I chuck parts that are less than 0.5" in diameter because the 6-jaw chuck can't hold smaller diameters.

JR, the 303 stainless steel 6" long 21 pitch knurl turned out well by pre-machining the diameter according the SmartPhone app "Knurling Calculator". I usually add another 0.002" to the calculated diameter. There are different knurling techniques but in my experience the pre-machining to the correct knurling diameter based on the knurl pitch guarantees the best sharp-pointed knurl surface every time.

Regards,
Paul