Can you come up with more of these?

Right Arm of the Lord.
Feet of clay.
Hand of God.
heart of Gold.
[b]Guts of a codfish
Ass of a bear! [/b]
Lips of wine.
Tongue of deceit
Tongues of fire.
shoulder of compassion.
heart of man.
bone of contention
Hand of friendship.
Finger of fate.
Mouth of madness.
Mouth of the jar. (bottle)
Mouth of the cave.
Mouth of the river.
ear of the wise
heart of the storm.
........bleh.......

(Invisible) hand of capitalism/the market.

heart of the matter

Hair of the dog

break leg ,theres no arm in that,🤣