At least in our climate I think more advanced corrosion tends to happen when the mower has been allowed to get wet either through being left in weather or inappropriate washing particularly in seaside conditions. In any case, it seems that the more exposed damaged mowers have the steel “cast in” sleeve bond to the shaft when there’s been a solution to promote corrosion.
I had a ‘75 Victa I rescued from a beachside place where the centre tore out. That machine was perhaps the most corroded alloy-based Victa I’ve come across.
