[TwinWillows]

I'd go with a good 4.5" angle grinder like a good heavy duty Milwaukee first. With the right grinding wheel it'll cut anything (wood, steel, masonary, etc) anywhere. You can find very thin cutting wheels that will let you remove thin slices of metal.

I had the exact situation w/my hydraulic top link not fitting into a cast boss on my old Oliver plow. A couple of seconds with the angle grinder using one of those thin cutting wheels & everything fit together fine.