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Leice prism carrier GZR3 - how to take apart?

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fobos8
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Alright guys

I did a survey in the pouring rain recently and my beloved Leica Prism carriers now have moisture inside them which has collected around the inside of the glass as shown in the picture.?ÿ

Does anyone know how to strip them apart so I can remove the moisture??ÿ I live in the middle of nowhere so would really like to do this myself. It would take too long to send them into a service centre. I'm very practical so I'm confident I can fix them.

Cheers, Andrew

?ÿ


 
Posted : March 30, 2022 11:46 am
Norman_Oklahoma
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Rice, a sunny window sill, plenty of ventilation, and about a week.?ÿ Good Luck.

Take it from a PNW lifer- it didn't get fogged up because you used it in the rain. It got fogged up because you left it sealed up in the box while wet.


 
Posted : March 30, 2022 11:51 am
fobos8
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Thanks Norman, yeah you're right

Would still like to know how to strip it down if anyone knows how. I've had a "residue" inside them before so it would be good to know how to take them apart to clean em up.

?ÿ


 
Posted : March 30, 2022 12:02 pm
chris-bouffard
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@fobos8 best not to do that, especially if they have seals.?ÿ There's also a strong potential to mess up tolerances.

?ÿ


 
Posted : March 30, 2022 12:23 pm
dmyhill
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order new ones, when you get them, send those in for repair...likely the estimate will cost more than your new ones

Once they get water in their, these types of things can get mildew and water spots (in fact that may be what you are experiencing). I have seen dozens of tribrachs go into the trash over that...

(Again PNW...rain is fine, just dry them out before enclosing them!!!)


 
Posted : March 30, 2022 1:19 pm

lurker
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If you are willing to experiment, how about the oven at 110 for a couple of days.


 
Posted : March 30, 2022 1:38 pm
jhframe
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I've never taken one apart, but it looks pretty straightforward.?ÿ Get yourself a pair of snap ring pliers (most hardware and auto supply stores carry them) and remove the snap ring visible in the photo by expanding it far enough to slide it off the bottom.?ÿ After that it should come apart easily. Take photos as you go and keep track of the small bits.

If you don't have snap ring pliers you can improvise with nails and pliers, but that can be pretty frustrating.?ÿ Once you've used a good pair of snap ring pliers you'll never want to use anything else on those things.


 
Posted : March 30, 2022 2:52 pm
dmyhill
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Posted by: @jim-frame

If you don't have snap ring pliers you can improvise with nails and pliers, but that can be pretty frustrating.?ÿ Once you've used a good pair of snap ring pliers you'll never want to use anything else on those things.

That is true wisdom right there.


 
Posted : March 30, 2022 5:06 pm
fobos8
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@jim-frame?ÿ

?ÿ

Right then that's it, I'm doing it! Thanks


 
Posted : March 31, 2022 12:20 am
kjypls
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They are extremely easy to take apart. If I'm remembering correctly;

Snap ring pliers needed at the bottom as already pointed out. Slide that stuff off. Then, I believe three screws hold the bottom portion to the top portion. It will all separate with no loss of adjustment in my experience.


 
Posted : March 31, 2022 9:27 am

fobos8
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Hi guys

Many thanks Jim and kjypls. All sorted. Took apart, gentle blast with the wife's hairdryer, back together no problem.

I needed to do a small calibration of the bubble level and eyepiece but now as good as new.

Will be keeping in the house from now with the box open.

Many thanks from a very happy surveyor


 
Posted : March 31, 2022 12:28 pm
Gene Kooper
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Posted by: @kjypls

It will all separate with no loss of adjustment in my experience.

As long as you DO NOT touch any of the screws around the optical plummet eyepiece!

I do what Jim does whenever the plummet needs a little bit of lubricant so that it turns smoothly again.


 
Posted : March 31, 2022 12:38 pm
fobos8
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Hi guys

All the moisture is out of the prism carrier but I noticed that there appears to be a small residue left somewhere inside. Maybe when the water dried off it left a small film of crap.

Anyone have experience of cleaning this off? It might be e DIY

It will either be on the glass in the eyepiece barrel (quite hard to get to), the 90 degree mirror (easy to get to), or the glass at the bottom of the carrier.

I have some lens cleaning paper and fluid that I use on my laser scanner mirrors that might do the trick.

?ÿ

Cheer, Andrew


 
Posted : April 1, 2022 12:57 am