Hi There - i have bought the modified skuttle drain. They are fairly simple to fit, if not a little agricultural........pull the original out, then "Shove" the new one in the gap the old one came out of! 
I think if you were to do the job technically correctly, you would take off the wipers and remove the skuttle panel to reveal the hole the rubber drain fits into.
There is a grove around the top of the rubber drain which with a bit of wiggling around does allow the rubber to fit around the metal hole and hold the drain firmly in place.
On originally fitting, i tested it with a bucket of water on the windscreen and some water did still go into the alternator - but no where near as much as with the original drain.
My solution was to tuck the modified drain behind the air con pipes up against the bulk head and now the water drains no where near the alternator............i just hope the pipes don't get hot and melt the rubber! :bang:
For now problem solved - so i hope this helps
I think if you were to do the job technically correctly, you would take off the wipers and remove the skuttle panel to reveal the hole the rubber drain fits into.
There is a grove around the top of the rubber drain which with a bit of wiggling around does allow the rubber to fit around the metal hole and hold the drain firmly in place.
On originally fitting, i tested it with a bucket of water on the windscreen and some water did still go into the alternator - but no where near as much as with the original drain.
My solution was to tuck the modified drain behind the air con pipes up against the bulk head and now the water drains no where near the alternator............i just hope the pipes don't get hot and melt the rubber! :bang:
For now problem solved
- so i hope this helps 
