I have no doubt why the following was proposed:
1.6.4 For the avoidance of doubt, daggerboards/centerboards will conform to the following :

a) Curved/’Banana’ boards will not be allowed.
b) Assymetrical cross-section profile boards will be allowed.
c) Fore/aft movement of the boards when in the down position will not be allowed.
d) End fences/horizontal appendages below the waterline will not be allowed. The board shall be capable of removal, without tools, via the upper opening of the case.
e) There will be no limitation on the daggerboard/centerboard length


But I'm wondering if the requirement- "The board shall be capable of removal, without tools, via the upper opening of the case."
Might "disallow" some hinged centerboards which otherwise would be legal in every respect??

Just a thought-- Are the Mosquito/Isotope/etc. centerboards all able to be removed "without tools" via the upper opening of the case??
<img src="http://www.catsailor.com/forums/images/graemlins/confused.gif" alt="" />
Kirt