Serious corrusion indeed. I have put heaps of inox on it and still no budging it. I have applied some heat around the rim near the axle but am a bit hesitant. I will continue the task after i control the grass.
The photo of the disc says it all.
I suspect the previous owner was a bit of a shall we say a careless driver and has collected something...
There are no cracks in the metal...I would shutter to think what a new blade plate would cost. I am in rough terrain so i only use 2 blades, i will try and straighten 2 and see how it cuts. There is still heaps of meat on the metal so blades won't come off.
Cheers for the help guys i will check it out soon and let you know the results.