Palm
Noun
てのひら
掌サイズの小さな電子辞書を買いました。
I bought a small, palm-sized electronic dictionary.
When you manipulate something, imagine you're doing it with your palm. You use your palm to manipulate the movement, and then you fine tune it further, all with your palm!
Where is the palm of one's hand? It's on your 手のhere (てのひら). Right here. I point to my palm, and say "hand here, is where my palm was."