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Hi Paul,
I had good support from Davis - this may be their busy season.  If I  
understand your question correctly, and if you have the traditional mirror, I 
think the screw goes through the spring clip and into a nut that is in a 
formed hole in the plastic.  Look on
http://www.davisnet.com/support/marine/parts.asp
for Repair Kit RO26G which has 8 springs, 3 screws, and 4 nuts for the Mk 15 
or 25.  It's $4.  There is another kit that also includes the two Mk 15 
mirrors for about $20.  All of this is for the traditional mirror.  I have no 
experience with the whole horizon mirror.

You may also be able to bend the spring clip so it provides more resistance.
Regards, Noell

>>> lists@HONYAKU-PLUS.COM 11/21/2005 3:39:49 AM >>>
I realize that this is not quite on topic, but I sent the following
message to Davis support and got no response. I've had approximately
three month's experience with a sextant, so I figure anyone here
would know more about it than I.  Any suggestions would be
appreciated.


--------------------------------------------------------------

Hi there.

The index error adjustment screw on the horizon mirror (the one
farthest from the frame) seems to be too loose even when properly
adjusted. The screw is easily jogged out of position, which of
course allows the mirror to shift. The screw seems to move quite
freely from side to side unless completely tightened, which of
course gives high a IE on the arc.

As a result, I get 10' to 20' of "index error" in a very short
period of time (like after one reading) when taking sights even
after having adjusted the mirror. At first I thought it was the
normal error attributed to heating of the plastic, but it is just
too much fluctuation too quickly for that to be the case.

Is this a common problem? Or, better yet, can you suggest a fix for
it?

Thanks.
-------------------------------------------------------

Paul Flint
Kawasaki, Japan
N35 35' 41" E139 30' 30"

   

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