I also used the dot snaps on the windshield and never had the cockpit cover come loose while towing. They can be a ***** to unsnap sometimes though.

outdoortextiles.com has all the stuff you need and the tool.

id say if you have a canvas shop nearby just use them, you wont spend more than $75 to have the whole leading edge of your cover replaced. after that get yourself a roll of shrinkwrap tape and use it to tape the leading edge of your cover to the boat when you trailer......

Rochford Supply has the press-n-snap for 90 bucks. I bought one to put the snaps in a swimpad cover I made last summer. It is a great little tool worth every penny, does snaps male/female and grommets. Works awesome.

rochfordsupply.com/product_listing.asp_Q_CatID_E_421_A_SubCatID_E_505 _A_ProdID_E_3390[/url]