Iain replied with all sorts of good stuff:
> IIRC, the vent has a bolt which passes through a thread on the
door and
> into the vent. It sounds as if the bolt is seized and the vent has
become
> unscrewed from the bolt. To get at the bolt head means, as you
have worked
> out, getting the internal casting off. This is secured by the top
glass
> retaining screws, which tend to get well stuck, and may need heat
and other
> means of persuasion to get them out. (Probably followed by
drilling and
> tapping to fit new ones :-( )
>
> You might be able to get the vent to close by applying WD40 to
the
> bolt,with the vent off, and screwing the vent back on hard. With a
bit of
> leverage on the vent, this should shift the bolt in a bit.
However, the bolt
> will remain partially seized, and when the vent is unscrewed, it
will most
> probably come off the bolt, rather than the bolt moving in the
door as it's
> supposed to. For the complete cure, the inner casting has to come
off, the
> bolt freed off in the door and the vent replaced and tightened
with a
> spanner or socket on the bolt head and the vent held with a lever
of some
> sort beween the operating lugs.
A better solution, once you have gone through the agony of the
removal of seized (oops, I mean drilling and re-tapping) screws
securing the air curtain deflector bit is to replace the mild steel
vent screw with a stainless one. I've done this on both top and
bottom vents on my Morso, many years ago and the problem has never
returned. Good fun this boating stuff, isn't it? ;-)
Rog
