has anyone else noticed that the cover cill is a definite problem where corrosion can start because it is fixed to the outer cill without a seal or an air gap. in my experience this will cause capillary action to occur and hold damp for a long time.
i have decided to fix mine with 3mm rubber washer at each screw hole therefore allowing water to escape and have airflow to dry it out.i am not concerned at ingress of water because of the drain holes in the bottom of the cover cill. the drain holes looked to have been punched from the outside on mine thus causing a small ridge to form on the inside and hold water. i have now punched them slightly out to allow water to drain freely. this may be a point worth noting for any one who wonders why they have rotten outer cills
i have decided to fix mine with 3mm rubber washer at each screw hole therefore allowing water to escape and have airflow to dry it out.i am not concerned at ingress of water because of the drain holes in the bottom of the cover cill. the drain holes looked to have been punched from the outside on mine thus causing a small ridge to form on the inside and hold water. i have now punched them slightly out to allow water to drain freely. this may be a point worth noting for any one who wonders why they have rotten outer cills