reasons for failure……….
- If the board had been allowed to free-fall to the
full-down position repeatedly, the bracket could be
weakened to the point of failure.
- Another possibility is grounding (or attempting
to retrieve the boat onto the trailer) with the CB
down, and not retracting it right away.
- But most fail due to stray current at the dock
location causing quick and sometimes severe electrolysis.
If the boat is docked or moored anywhere near shore
power, you will be amazed at how often there is a
considerable amount of “stray” current
moving around that area.
To remove the existing CB hanger bracket, you will
need to remove the nuts and washers from inside the
boat on the cabin sole. If your board is already out,
you can't simply pull the bracket out by
grabbing the board, so you may need a small drift punch
and a hammer.
Pound the studs downward. There is 3M-5200 bonding
the bracket to the top of the CB trunk, and it may take
some effort to break that bond. Use care, but don't
be afraid to use a little force. And consider using
Debond 2000 Marine
Formula™ to loosen the 5200
From under the boat, inside
the CB trunk area, spray the Debond 2000 on any 5200
adhesive that remains attached to the CB trunk at the
point where the bracket/bolt holes are.
Use whatever you have that is long and reasonable strong,
a crowbar for example, to scrape the 3M-5200 adhesive
from up inside the CB trunk. You want to do this to
get a smooth surface for the new bracket to mate against.
It may take several applications of Debond and several
scrapings to get the surface are clean inside the trunk
before you can start the new installation.
(While you've got the centerboard out of the boat,
it might be a good time to sand it, fill any chips and
cracks with epoxy, apply barrier coat/bottom paint to
the board and the inside of the CB trunk)
the new bracket onto the centerboard, and place the
pin inside the bracket. The pin is not fastened in any
way, it is simply held in place by the sides of the
trunk and it can easily fall out, so use masking tape
to hold it in position.
Then, angle the bracket so it is in the position it
would be with the board in the full-down position. Use
several lengths of tape to secure the bracket in that
position and to hold the floating pin in position.
Have an assistant get inside the boat with washers,
nuts and tools.
a generous bead of 3M-5200 to the top of the bracket.
Grasp the centerboard and lift it up into the CB trunk
and carefully align the studs with the holes up in the
centerboard trunk. Push the assembly into place and
have the assistant quickly drop on the washers and nuts.
Have the assistant then tighten the nuts - alternating
between each nut until the bracket is snug against the
top of the trunk.
Re-attach the CB pennant (replacing
it with a new one at this time would be prudent)
You will have to cut off the ends of the studs once
you have the bracket all tightened down. A hack-saw
or Dremel tool with a cut-off wheel will do the job.
Then re-install the cap plugs that cover the CB hanger
studs and special cap plug washers.
Also, when you re-attach the CB pennant, adjust it
so that if the board free-falls to the full-down position,
that the pennant will stop it before it hits the forward
face of the trunk.