How do you replace a scupper

For future reference, I found the replacement at
http://www.amback.com/ProductDetails...roductID=59651
Some owners have replaced with Stainless steel drains. My experience with these are that they tend to stay scummy and get barnacles if you keep your boat in the water. My plastic ones lasted 18 yrs, so I'll just stick with them at $10 per.
Also, glad to see a sight devoted to the V20. I've had mine for 3 yrs. now and haven't had one problem. ANyone around here live in the Savannah, Ga. area?