You can also enlarge a hole in fiberglas with an electrician's reamer which is designed to be used on junction boxes and the like. It'll chuck in your drill and will allow you to progressively widen the hole to size. Home Depot carries them in the electrical department. If you want to open the hole off to the side you'll probably find that a Dremel tool or a Rotozip will do the job quite well using a dry wall cutting bit. I prefer the Dremel myself for it's versatility and the Rotozip drywall bits will fit it. Again, available at Home Marina.
Lighten up Dog, I had a bit of trouble cottoning on to the OP as well. and you just layed into a member with only five posts who might have been under the impression we're friendly here. (g)
“Scientists are people who build the Brooklyn Bridge and then buy it.”
Wm. F. Buckley, Jr.