I've been struggling with these for a few year, normally just ripping them off at the start of the stage because they slip. Before I just replace them with some aadmounts, tenebraex says the ones for the AMG are unavailable, what have you guys, who also have your defender caps slip, done to keep them in place. Yes I'm sure there are plenty of guys why have never had an issue, that has not been my observation though.
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Rifle Scopes Securing Vortex Defender Caps
- Thread starter Outcome
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I've wrapped masking tape around the objective and eyepiece to not only make the caps fit tighter, but also to add grip for the caps. The new ones do seem to grip better though.
I have lost the objective cover when hunting. Some double sided tape has kept its replacement in place.
A very good fix, as some do slip, that a buddy told me is to take some hair spray and spray it on the inside of the cap body that grabs the scope. Just roll the soft part back so the inside is exposed and give it a spray and then put it on the scope. It really does help it stay and doesn't damage anything. I used it on one of my caps that was slipping and it hasn't since.
I use electrical tape to increase the scope diameter until the caps fit snugly. Then, I add a strip of electrical tape to the outside of the cap, to tape the cap to the scope. Has worked so far. As an added benefit, once you set the diopter adjustment, a wrap of electrical tape prevents you from moving it inadvertently.
The other thing I have done is to use a wood chisel to adjust the latching mechanism on the cap. The cap doesn't need as much engagement as is available to stay closed. By chiseling some smooth (the part on the left side in this case) I have extra leveredge to open the cap, and the cap has less resistance to opening. This defeats the tendency of the cap to try to pop off when I'm trying to open the lid. I'll try to add a picture tomorrow...
I use a zip-tie and file the nub down where the excess tie is trimmed so it doesn’t scratch my hand.
I took mine off my scope...and then threw them in the garbage. I think Vortex as a company has a great model and makes some good products. I was so utterly baffled they let these out into the real world I had a hard time getting my head around it. It's like they didn't even bother to test them before they put them in the package and marketed them. Mine either didn't open, or just came off completely when I tried to operate them. I'm not a real big "tape on scope" type dude so away they went. I will say this, that hairspray idea is a good one. I am sort of anti-hair product as well however, (not just on scopes) so that won't work for me either. 
Hairspray.....can't believe that one slipped by. All the years I raced motocross we would put on our new grips with hairspray. It works, thanks Rob01, now i feel my age
This the best method I have used and so far it works. I have not lost another cap since doing this mod.
A couple wraps of electrical tape on the scope to increase the tube OD works well (3M #2228 works very well as it's 1.6mm thick.) Another solution is a piece of large diameter heat shrink on the outside of the rubber collar.
Low profile inline-style zip ties work well too and are less snag prone than regular 90 degree entry zip ties.
Low profile inline-style zip ties work well too and are less snag prone than regular 90 degree entry zip ties.
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