I have some masters I use that have some pretty tight spaces. So first go around is with a 1/2" bit, then 1/8" to get the finer details. Don't do that often, but works out well when I do.
NC via the Army in 1979; retired 1981, just east of Raleigh ever since.
Remember, when I tell how I do something, that does not mean I recommend you do it my way. Different backgrounds, experiences; what works for me, may not for you.
"It ain't what you're told, it's what you know." - Granny Weatherwax
No point in believing in things that exist. If they exist, you don't have to believe, they just are.