Wow - thanks, everyone! The knowledge just keeps flowing. I am amazed every time I log on, at the helpfulness of this group. Outstanding character. I truly can't say thanks enough.
I have a large piece of tempered glass to use as a roller to check straightness, and have contemplated using the roller mechanism of cabinet roller catches to make a spin-type tester, that would hold the shaft close to the base, so I could gauge the high spots better. Experimental, I know - but I already have those things around the shed, so it's worth some of my time to try.
Until I learn more about the different finishes, I will probably start with Min-Wax Polycrylic as a finish. I have fletching tape and Saunders NPV now, and Duco on the way. I am hoping the tape will adhere well - now that I have tried it, I like it!