Good morning companions, it is to ask you the favor if someone can help me with a whirlpool washing machine of the electromechanics which I need to remove the agitator to lower the transmission and the screw is rusty, I already wd40 since last night and I have not managed to loosen it, the problem is that the quadrant of the head is round and the key skates to me to force it to loosen it. I infinitely thank who can help me, thanks

Get a 10 mm exagonal tube. The striatum when worn patina.