cap
鐏 centers on a metal cap or ferrule, typically the metal fitting at the end of a handle, shaft, or scabbard.
鐏 combines 金 (metal) with 尊, which likely contributes the sound. The character refers to a metal cap or ferrule, fitting the metal radical.
The left side 金 means metal, and the right side 尊 can be thought of as a respected or important object. Imagine a metal cap that protects the end of a valuable staff or sword, like a crown for the tip.
For ソン, picture a metal cap on a son's favorite walking stick: son -> ソン, and the metal cap keeps it safe.