re: Cutting tenons on the shafts

Dave,
I used to be nearsighted, had cataract surgery, and the surgeon asked what type of lenses I wanted - near or far. I picked far sighted because I've had to wear glasses since I was 8 and thought going without them would be nice. I wish I hadn't.
Prior glasses were on all time & only removed for up close - which worked great for me. Now, have to carry reading glasses everywhere, and it has become an inconvenience. 
Food for thought.