Bill, The CB change for cast iron to laminated fiberglass/lead occurred around hull number 400, roughly early 1988. I have 1988 hull #407 and it has the fiberglass/lead CB but steel punchings for ballast. As far as I know all the non-cast iron CB's are fiberglass/lead. I believe the same fiberglass/lead CB is used on both the 15 and the 17. The change from steel punching to lead ballast occurred sometime after hull #407. The best way to tell which type of ballast a 17 has is to see if a large magnet is attracted to the keel (takes a pretty good size magnet for the test). Randy Graves On Wed, Mar 27, 2013 at 2:38 PM, Bill Wickett <billwick@gmail.com> wrote:
Who can advise the year that the CB was changed from iron to laminate? Which CB would an '89 M17 be likely to have? Would the ballast be iron or lead?
Thanks,
Bill Wickett Makin' Time M17 #622