Why you should grease the spitfire differential bolt

Needed to take the differential off from the parts car because the casing is broken on the one I have.

After much heavy banging, days of wd 40 and heating that bolt would still not move ! Turn but not move.

In the end had to cut the bolt in the middle, weld a hook to the bolt and pulled it with a hoist with the addition of much much heat.
Lesson learnt, see the bolt is still "welded" to the metal part of the bushes.