Which way's up? (Part 2)

Some players (or customizers on behalf of players) place material on the harmonica (most commonly on the comb) that helps you feel if you have the harp right-side up. A rhinestone, an inset dowel or label for the key of the harmonica are all good examples. One of the fingers of you left hand commonly touches the back comb of the harmonica while cupping the instrument... if you place it there, you'll know immediately if you you're holding the harmonica right-side up.