I remember the days of hand fitting those flair shaped footings. Some went together well, and some I sanded on for hours.
The one thing I did learn about hand fitting those type footings was to never force those tight together with clamps. I had my first riser failure doing that.
If I had a CNC set up and the knowledge of writing programs for them, I would build custom footing jigs for pattern sanders. Brandon Stahl from rose oak creations built some years ago that I was fortunate enough to have a couple custom jigs built.
He had it down to a science. They make footed risers much easier to build without all the sanding involved. Kirk