Forget grinding. Forget scraping, no need for all that messy bluing ....
...... what you need is a SLEDGE HAMMER
![:lol:](https://madmodder.net/Smileys/default/kranke_200-1.gif)
I found this searching Youtube for examples of my JCB 803 - this is a slightly later 802 model that they are wrecking - they don't ever seem to consider that the slew ring gear may be warped as well as it's seat
![:bugeye:](https://madmodder.net/Smileys/default/confused0068.gif)