Armory Sponsor
Posted: 4/24/2014 8:11:29 AM EDT
| The objective lens on my 14 is a little stiff and jerky. It never bothered me till I held a unit with a nice smooth twist. Any way I can smooth mine out? |
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Yes, but you have to disassemble the entire scope to get to the locking ring on the inside. This is a common maintenance issue that just requires a little silicone grease to fix. Unfortunately the only way to get to the O rings is to take the scope apart. Your grease dried up and that is why it is stiff. If not serviced it will eventually tear up the seal. No big deal as the seal is cheap.
Removing the objective lens requires a special tool most don't have. The tube retaining ring is easy to remove with homemade tools but the objective ring sits far inside the scope. It can be done but the correct tool sure makes it a lot easier... 
I grease mine every few years. That seems to be about how long it takes for the grease to start drying out. |
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Does this require any kind of special silicone grease?
I have an eyepiece lens that the diopter adjustment is very, very stiff on. I've taken it apart and the threads are all good, but the o-ring is definitely not lubed. Would some silicone grease (special or not) be OK for the eyepiece o-ring too? |
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Quoted:
Does this require any kind of special silicone grease? I have an eyepiece lens that the diopter adjustment is very, very stiff on. I've taken it apart and the threads are all good, but the o-ring is definitely not lubed. Would some silicone grease (special or not) be OK for the eyepiece o-ring too? I just got some silicone grease. The stuff I got is marketed for brake components, but is a pure silicone grease. I'm pretty sure the reasoning behind it needing to be silicone based is so it won't attack the rubber O ring, so someone correct me if I'm wrong. I'd also like to try some on the ocular lens O ring, unless someone advises against this. Dino, what tool is needed for the lock ring, and where can I scoop one up? I've never removed the objective lens and the tube lock ring I can get out by hand. |
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Quoted:
Does this require any kind of special silicone grease? I have an eyepiece lens that the diopter adjustment is very, very stiff on. I've taken it apart and the threads are all good, but the o-ring is definitely not lubed. Would some silicone grease (special or not) be OK for the eyepiece o-ring too? Dielectric grease from any automotive store will work fine. It is just pure silicone grease. As already mentioned silicone won't attack and degrade the rubber O rings. |
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Quoted:
I just got some silicone grease. The stuff I got is marketed for brake components, but is a pure silicone grease. I'm pretty sure the reasoning behind it needing to be silicone based is so it won't attack the rubber O ring, so someone correct me if I'm wrong. I'd also like to try some on the ocular lens O ring, unless someone advises against this. Dino, what tool is needed for the lock ring, and where can I scoop one up? I've never removed the objective lens and the tube lock ring I can get out by hand. Quoted:
Quoted:
Does this require any kind of special silicone grease? I have an eyepiece lens that the diopter adjustment is very, very stiff on. I've taken it apart and the threads are all good, but the o-ring is definitely not lubed. Would some silicone grease (special or not) be OK for the eyepiece o-ring too? I just got some silicone grease. The stuff I got is marketed for brake components, but is a pure silicone grease. I'm pretty sure the reasoning behind it needing to be silicone based is so it won't attack the rubber O ring, so someone correct me if I'm wrong. I'd also like to try some on the ocular lens O ring, unless someone advises against this. Dino, what tool is needed for the lock ring, and where can I scoop one up? I've never removed the objective lens and the tube lock ring I can get out by hand. The special tools from ITT are high dollar stuff. Most folks fashion there own out of PVC pipe and a metal strip, the strip can be cut and melted in to catch the retaining ring notches as shown in my pic. A good friend of mine with machining tools made my tool sets. I refuse to pay what ITT wants for their tools. I have used them and while nice I like my tools better. Your best bet is to fashion your own. Dental picks found easily on eBay are very useful for working on night vision. Many times I can get a stuck ring out with just a couple dental picks. Epoxy also works wonders for holding the pieces of metal strip in your PVC pipe you notched out to the correct diameter to remove lock rings. My tools are pictured below. The longer tool is used for objective lock ring removal. If you look hard you can see the notch on the end. 
The ocular lens also has a O ring to be greased. Might as well get them all while you have the scope apart. 
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