Rule 3.2.1 says that any type of retaining device can be used to position the board vertically as long as 3.2.4 isn’t violated. It doesn’t mention Rule 3.2.5. Are not the blue stops a retaining device to position the board vertically? If so, why can’t they be changed to strengthen them? ...
I meant to bow out of the discussion, but, there seems to be some misunderstanding about the type of change that might reasonably be made to the daggerboard stops.
The Lasers have a similar stop on their board. Here is an excerpt from the Laser rules.
"The components of the "Builder Supplied" centreboard stopper may be secured together by glue, screws, bolts, nuts and washers, provided the original shape and dimensions are not reduced."