HHT36AXB
Increased vibration:
Possible cause: Blade nut loose

Tighten nut bolt to 20 Nm ensuring the blade, nut shield and dome washer are all present and central (always wear protective gloves)
Correction
Possible cause: Blade nut loose
Tighten nut bolt to 20 Nm ensuring the blade, nut shield and dome washer are all present and central (always wear protective gloves)