[pianotech] Hardware part..don't know the name

[Gary]

Yamaha C3, when screwing the leg bolt on, it goes up into a round piece 
of  metal with a threaded hole situated in the keybed.
I need one, but don't know the name.  Hope my description makes sense; I 
should get with the 21st century and get a phone with a camera.
thanks all,
gary