Drum will not come off even after breaking free(SOLVED)

[Pinchlite]

I just had to fenagle it with more force and did not need to back off shoes.

There is a slight groove but no as much as I was expecting to see in the inside of drum.

I am putting new on btw.

Now that it is off,sprayed and wiped down waht would be acceptable pad thickness in mm.

Thanks as allways.