I have been making Red Osier (Dogwood) shoot shafts for years. I typically collect shafts that are slightly larger than what I will need. After initial drying and hand-straightening, I run them through a 3/8" dowling jig and put them aside to finish seasoning. When they are dry I plane/scrape/sand them down to size, checking them on my home-made spine tester as I go, and stop when the desired spine is reached.