The boat has a cabin lining which is a single-piece GRP moulding.


Okay, so they put in the bolts, then glued or riveted the liner in. The liner
won't come down and you can't slip a wrench in their to grab a bolt. You'd
never get a bolt back on anyway in that case. That sucks. But cutting access
areas into the liner is a good idea. A Roto Zip tool (use the depth setting)
can make this a neat job. Set the depth to JUST through the depth of the liner.
You could then make teak plugs for the holes you made later on. Be careful not
to cut right up through the deckside!
Do it slowly and plan it carefull to avoid a mishap that will leave you with a
larger repair and glass work.
Why not take pics of this job before and after. Done right, you'll have made a
nice repair and an improvement to her that will help sell her when that day
comes.

Good Luck,

RB