Hello again all.
i used electrolysis to remove all that rust.
i have an old pc power supply and use the 5 volts at 16 amps output. using a sacrificial anode. (my bbq plate).immersed in a solution of water and baking soda then added the bbq plate above the mower base. left for about six hours.
i just removed it from the bath and hosed it off whilst lightly removing gunk with a wire brush.did nothing else. and it was real real bad to begin with.
look up electrolysis rust removal.
