Honestly buy a new one,
For the hassle of cleaning it out filling it with an epoxy resin then drilling a pilot hole then taping a new thread to fit? Easer to buy a new one for around $30 to the door…
The black stuff may be from a previous repair like a rubber sleeve jammed on? Mine were like it as well. I did the repair. I even hand painted the white inlay.
Then I found out how cheap they are afterwards.
Wouldn’t stuff around again.
You will find the part number in the Repair Parts Scales.
Cheers Phil