I had the same issues and you can fix this too. Go to the auto parts store and ask for 1/8 inch silicone vacuum hose, about 4 -6 feet cost you about $5-6 dollars. Cut to size with about 1/8 inch extra to fit the channel. add a little RTV sealant to provide a seal between the two ends. and you're done. I did this to all my portlights about five years ago and not a single drip or leak since. I'll try to take a pic of the port and a picture of the vacuum hose later today.
