Candy,
I find using soft Robinson brushes (about 5/8" in diameter) on
my lathe or handpiece works really well for getting into those
tight transitional type areas. Or course, use a different brush
for every polish type. I also find that you can use the
semi-worn brushes to polish delicate areas. You need to use a
light touch though as the brushes have a metal center and you
don’t want that to touch your piece. Most jewelry supply places
have these brushes or anywhere that sells dental laboratory
supplies would have them.
Happy polishing!!
Richard