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so you reckon just cut through it the width of the cutting disk, then fill the gap with weld?
Yep, if the disk is 3mm thick, cut it 3mm. If the disk is 1mm, cut it 1mm.
If both pieces of metal are cracked. Cut through both. If a crack stops before the edge of the metal - drill the end of the crack to stop it continuing later.
Cut it with the grinder so the metal is clean and the weld is strong.
If whitesedan is talking about the cupped washer on the other side. I dont know why you would worry about trying not to cut through it if you going to repair it.
Would be easier to repair this than to weld on another bracket in the correct place.