NavList:
A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
Re: Mark 15 Maintenance Question
From: Paul Flint
Date: 2005 Nov 21, 23:56 +0900
From: Paul Flint
Date: 2005 Nov 21, 23:56 +0900
Noell, Thanks for the input. Emboldened by your advice, I removed the screw and the metal clip and bent it ever so slightly inward. This seems to have solved the loose screw problem. Thanks again. Paul On (11/21/2005 10:38:05 PM) Noell Wilsonwrote: > 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" Paul Flint Kawasaki, Japan