I don't think you are going to replace it, or at least it is not worth the hassle.
I am pretty sure that threaded insert is pressed/pinched onto the leg with a huge press. I have often had them come loose and start spinning with the leg leveler.
As previously mentioned, put a nut on the top and bottom of the leveler. Also, put on a washer on either side to keep the nuts from binding when you turn them.