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To: terry michael <OEA51@go*.co*>
Cc: techdiver@aquanaut.com, info@ha*.ne*
Subject: EE and steel screws in aluminum (was Re: halcyon vs DiveRite)
From: Olaf Trygve Berglihn <olafb@pv*.or*>
Date: 18 May 2001 15:20:31 +0200
terry michael <OEA51@go*.co*> writes:

> Aluminum is always a compromise but SS is too heavy to do a Goodman
> handle and titanium is expensive. For people that are new to these
> things just make sure you get it set-up the way you want it up front
> - lubricating aluminum threads is really not so effective in this
> case.
> 
> I agree with Olaf the SS static set screws in the aluminum will not
> come out without breaking the screws off and if your not using the
> reel but taking along in salt water then the dynamic lock screw will
> tend to freeze as well.

I've been all around town today (Trondheim, Norway) to get someone
to remove the broken screw and redo the threds. I finaly got someone
at the physics lab at the university to do it (after a lot of hassle
about doing private stuff in the shop). The screws in the Goodman
handle are realy too tiny, and here in Europe, most people just shake
their head at the american thread-system. Well, I'll get it rethreaded
with UNF-threads. Good for me.

The problem is not solved, however. I'll have to be very careful and
regrease the screws quite often. I.e. if I dont want them to corrode
shut. When I think of it, I'm really amased that EE/Halcyon guys have
not chosen some other design, not using different metal types
together. Using steel screws (acid resistant ones, even) in aluminum,
will create a electrochemical potential -> the aluminum corrodes. With
the presence of an electrolyte (such as salt water), this process is
quite rapid. Anyone dealing with metal constructions know this, it is
"accident waiting to happen".

I can say many good things about the EE-Apollo and the Pathfinder
reels, but I would never buy another one, just because it is not good
enough - especially not in salt water. It might work well over time in
Wakulla, but I guess most people dive elsewhere (with haloclines, og
just plain salt water).

While we're at it: the apollos come with a cord which only has a
waterproof outer cover of rubber. If you manage to tear a hole in the
outer insulation, your canister and lighthead will flood. I will soon
replace the cord with one that is total waterproof (should have done
that a long time ago). Also, there are several reports of floods of EE
lights in Norway when being used to 100 msw recently. The o-ring seem
to pop out of place. I'm not sure why, and it might be because of a
leak somewhere else (through the switch?) that causes a pressure
increase inside the canister that will pop out the o-ring when
reaching shallow water. You obviously need a quite big leak for this
theory to hold. Really, there should be something holding the o-ring
in place, and a different switch design should be considered (magnetic
without a hole trough the canister lid, maybe?).

But all in all, I've not yet found many other products that match the
quality of Halcyon/EE. But they are not completely DIR in my
definition.  If I ever want really to be DIR with my primary lights
and spools, I would have to make my own.

Olaf
-- 
Olaf Trygve Berglihn <olafb@pv*.or*>
--
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