My custom version of a painter's point. I have a bunch of the traditional ones, and they work great for panels and wider workpieces, but are almost useless for narrow workpieces.
When I was making my grandson's crib, I took a few furring strips and drove a bunch of drywall screws through them pointing upward for finishing the spindles. They work reasonably well, but aren't very flexible.
These should work great for smaller workpieces.