Frank Adam wrote:
Q: Which of the tools removes the Rolex Oyster Perpetual back cover?
The proper opener should be a round ring which fits the back
http://www.ofrei.com/page557.html
....
Mind you, dropped watches are not really an indication of a quality
problem. Rest assured you have a fine watch there.

Yes. That Rolex is absolutely BEAUTIFUL INSIDE (from a metalworking
standpoint)!

When I first bought this used Rolex, it didn't keep good time (losing
perhaps a minute a day). I opened the back simply by using a small
flathead screwdriver in the notches, twisting out the normal way. I was
AMAZED at how BEAUTIFUL it was inside! Honed out of a single block of
stainless steel & gold, it seemed. There was a fine gold coiled spring,
with a big counterweight, and what looked like a solid silver
backplate, and a red stone in the middle of the spring and a very easy
to adjust adjustment lever with a few alignment marks on that spring.
The entire inside was an absolutely beautiful sight. I adjusted it for
a few weeks until I got it down to a loss of about 20 seconds a day but
I never did get the timing exact. (Maybe there are other not-so-obvious
adjustments?)

I closed it up each day as tightly as that screwdriver would allow me
to.

Then one summer, I went swimming in a volcano in Greece (Thira) and the
sulphur got inside somehow and gummed it all up. That's when I had the
$800 repair. I haven't opened it since then because I'm told it's been
sealed with Argon gas. Is that true?

My point is, the case can be opened with a screwdriver but I prefer to
use the correct tool (so I'll check out the wonderful link you provided
above); but I'm asking an ancilliary question of alt.horology ... which
is...

Once opened ...
Q: Does the Rolex need to be sealed in a special gas environment?

P.S. Removed scuba as this no longer applies to scuba diving ...