Enlarging the Water Pickup Hole on the Rudder...

[larryrose11]

IM facing a similar issue. The pickup is the smallest diameter of the cooling circut, not good. My solution was to fit a square brass tube on the back of the rudder. I found stock at the LHS that was the dame thicknedd as the trailing edge of the rudder. I have yet to try this, but I will next time I run this rigger.