handle, lever, knob, authority
棅 centers on a tool for grasping and controlling: a handle, lever, or knob. The authority sense extends naturally from the idea of holding the means to direct or operate something.
棅 combines 木 (wood) with 秉, which likely contributes both sound and the idea of grasping or holding. The character is a variant form of 柄, sharing the same core meaning of a wooden handle or authority.
The left side is wood 木, and the right side 秉 looks like a hand grasping a bundle of grain. Picture a wooden handle attached to a tool, giving you the lever and authority to control it.
For ヘイ, imagine grabbing a heavy wooden lever and saying 'Hey!' as you pull it: Hey -> ヘイ, and the handle gives you control.
—