Have you considered one of these: http://www.westmarine.com/webapp/wcs/stores/servlet/ProductDisplay?productId=35103&catalogId=10001&langId=-1&storeId=11151&storeNum=50523&subdeptNum=50566&classNum=50567#.UGB8q67UCj0 (Anchor Marine Through Deck wire seal).
I have one on my 24 and it hasn't leaked in 4 years. Marek s/v Fennel C&C 24 Ottawa
_______________________________________________ This List is provided by the C&C Photo Album http://www.cncphotoalbum.com CnC-List@cnc-list.com