Take out the shaft enough to give some clearance on the left end (End nearest to motor). Weld one of the end washers on, staying clear of the second washer.
Push the shaft back in and measure and mark a distance on the other side of the shaft to put a cotter pin through.
Carefully take out the shaft all the way and drill the hole for the cotter pin.
Fit the shaft back with all washers and lid in places, ensure the cotter pin fits.
Check the motion in the hinge by lifting it up and closing again.
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