‘View through the cover plate’ to me suggests without the circular plate on the ’ back ’ of the clutch rather than with the drum removed. This view shows there are nine lightening holes in the ‘spec’ clutch shoes for the T4 series plus 4 alternative 'non tech ’ springs . Shoe weight and spring strength alter the engagement RPM. Peceived wisdom is that the clutch should engage at RPM corresponding to maximum engine torque if rules allow.Many happy hours and $ can be spent searching for a ’ magic ’ setting.
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