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ImageShack.usgot there in the end, but must add that you check the bearing, it can go in the wrong way! in which case the disc wont turn.luckily for me i managed to strip the bearing down without removing the races from the shaft and turn the bearing casing around. Something to be said about more haste, less speed!
And you were dead right about the 9" grinder, it wont budge without it, but i did manage to get the new one on with a lump hammer