1980"s era 20sf's

[strick]

I should know this but just wanted to check with the pro's...I think I remember hearing that the later 80"s 20sf's are slightly longer then the earlier Potter era models? I see on the net where some are calling them a 21 rather then a 20. Also I remember something about a hook in the hull...I think that was on a 23 mold. Any thing in particular to watch out for if one was to re do a later 80's 20sf? Sandy I know you have one...

strick