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Thread: Adjusting Parallex on Leopold Nonadjustable Scopes

  1. #1
    Boolit Master
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    Adjusting Parallex on Leopold Nonadjustable Scopes

    I have a 6X36 Leupold scope I want to adjust from the factory set 150 yards, to 75 yards. Parallax is pretty bad at the shorter ranges. I have the lens adjusting tool, and have done other non Leupold scopes. The 1/4" lock ring on the objective lens is on so tight, it won't come off by ordinary means. I don't know if there is thread locker on it. I have tried grip tape and gripping gloves, with no success. No slippage, but it just won't turn. I do have a rubber strap wrench to try for a more aggressive approach. Does anyone have any experience on Leupold scopes that they might share?

    I talked to Leupold, and they want $75 to do this service, and figure another $20 to ship it out there with insurance. $95 is a lot of money for a simple job. I would rather not send it out if I don't have to. They used to do this service for free, charging only for the cost of return shipping. Times have changed.

  2. #2
    Boolit Master
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    Not familiar at all and don't know what fluids would migrate into, but the best "undo'er" I've ever use was a 50/50% mixture of acetone & transmission fluid. Let it soak in and it loosens all sorts of stuff.

  3. #3
    Boolit Master
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    I would have a lot of concerns about using any form of penetrant on a scope.

    Perhaps, you could set the scope out in the sun on a bright, hot, sunny day and get it good and warmed up. If there is any thread locker, which I rather doubt there is, that might soften it enough for you to loosen the lock ring. Using some form of heat gun may create too much heat whereas the sun shining on the scope is normal exposure, more or less. I have adjust several Leupolds for 22 RF range parallax and have never had a problem getting the lock ring loose.
    Liberals don't know they're stupid in the same way a fish does not know it is wet. It is just their natural state of being.

  4. #4
    Boolit Master
    lefty o's Avatar
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    its all fun and games til you cause a leak in the scope. letting the gases out, and the moisture in.

  5. #5
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    ShooterAZ's Avatar
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    This^^^. I'd rather spend the $95 dollars, than have a useless scope.

  6. #6
    Boolit Master
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    Quote Originally Posted by ShooterAZ View Post
    This^^^. I'd rather spend the $95 dollars, than have a useless scope.
    Useless, really??
    Liberals don't know they're stupid in the same way a fish does not know it is wet. It is just their natural state of being.

  7. #7
    Boolit Master
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    I got it. I used wood blocks with a 1" groove to grip the scope body. Put duct tape around the tube for gripping and protection. Put the assembly in a vise, with a wrap of duct tape around the end cap, for gripping by a rubber strap wrench. I made the vice just tight enough so the scope would not turn. The end cap then came loose with the rubber strap wrench without further issue. The internal spanner nut took 1/2 turn to eliminate the parallax. It's perfect now 50-75 yards for my 12ga slug gun. I screwed the end cap back tightly by hand, cleaned up the tape residue on the scope with lighter fluid. It looks like new, not a mark on it.

    I talked to Leupold, and this is basicly how they do it. They clamp the scope in a machine, and unscrew the end cap. As long as you don't remove the lens from the tube, you don't loose any nitrogen. There are lubricated O rings inside that are made to slide to allow this adjustment.

  8. #8
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    ShooterAZ's Avatar
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    Glad you were able to get it done. This is something I would never attempt, for fear of breaking the seals.

  9. #9
    Boolit Master
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    I have re-done the parallax many times on a substantial number of Leupolds, and I'm not even a DIY'er type normally.

    With a good set of small strap wrenches, it's just so straightforward - easier than simply packing one up & mailing out.
    Have never needed to defeat thread locker or use penetrants, but yes those lockrings can be on pretty tight sometimes.

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BP Bronze Point IMR Improved Military Rifle PTD Pointed
BR Bench Rest M Magnum RN Round Nose
BT Boat Tail PL Power-Lokt SP Soft Point
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