Remove the bolt, washer and blade. Use a wire brush or sandpaper to clean the end of the shaft and the blade where they make contact. Clean both sides of the washer. Clean the underside of the bolt head and the bolt threads (with a wire brush). Put just a little oil on the bolt threads and on the underside of the bolt head. Reassemble.
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Remove the bolt, washer and blade. Use a wire brush or sandpaper to clean the end of the shaft and the blade where they make contact. Clean both sides of the washer. Clean the underside of the bolt head and the bolt threads (with a wire brush). Put just a little oil on the bolt threads and on the underside of the bolt head. Reassemble.