For projects like making bowls or for segmentation, hiding the entry hole is always an issue. Even for fretwork projects this is sometimes an issue as well.
I'm wondering if anyone has some tricks up their sleeve to deal with this problem. I've found some things that help, but it seems that no matter how much care I take the entry hole still leaves a flaw that I see; perhaps no one else does but it still bothers me.
Let me add that over the last year I have discovered the very small numbered drill bits and I found that a convenient way to use them is with a so-called woman's drill that I picked up in a crafts store for about $20. It is much like a hand-held plug-in Dremel tool but somewhat lighter in weight and it has a pin-vice suitable for holding the smallest of bits.
This morning, I made an entry hole using a #68 bit, then passed a tiny spiral blade through the hold and used a hand-held frame to tension the blade. This allowed me to enlarge the hole enough to fit a small flat blade and enlarge the hole a bit more until I could fit the blade I wanted to use to make the cut. The entry hole was pretty small, but it still is a visible flaw in the final cut. Perhaps I just need more practice, but again, if anyone has some better way to do this I'd certainly be interested.