Wow thanks for all the current input. I did try to razor blade the blisters off and it does take it down to see the factory grind marks, Not very smooth but was a start.
I can't use any rust converters as they will fill in the rotating gap.
I have most of the products mentioned here kicking around so I'll start there.
I did the paint as this thing is sitting in the way and where I need to move it I can work on the door opening.
This is Cast Steel and not Iron, amazing as it is cast together than opening is machined, the inside and exterior have rough mold marking and chisel marks all over while removing the casting material.
I think maybe I'll try blade scrapping, than oil (wet) sand and see if vinegar would help clean the craters. I have lots of 3M wet o dry from 320 - 3000 so I'll use 320 - 400 grit and see where that gets me.
I did try a wire brush by hand and one on my die grinder and they really didn't have much impact
I'll keep you all posted as I throw whatever I can at it.
Sawyer
