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Question Opening a Hawke scope

Discussion in 'Anything Airgun Related' started by Ruddles, Jan 25, 2014.

  1. Ruddles

    Ruddles Engaging Member

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    I've checked the forum (and read http://www.airgunforum.co.uk/forums/showthread.php/173554-hawke-scopes), and I've Googled and Youtubed, but not really found the answer to this...

    Is it possible to open a Hawke Sport-HD 3-9×50 IR (HK3016) at the objective end in order to refocus the lens to an air rifle-type distance?

    I've applied bags of muscle but it won't move. One suggestion I've read is to heat the housing with very hot water and then use bags of muscle. Has anyone done this successfully?

    Thanks in advance.
     
  2. PhoenixElite

    PhoenixElite Engaging Member

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    I managed it with my old Hawke 3-9x40 sport, which sounds pretty similar... once you finally get the lens cover off its easy, doesnt need much of a turn at all to refocus to shorter ranges. good luck mate
     
  3. Ruddles

    Ruddles Engaging Member

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    Thanks. Down to Screwfix for some Stilsons then!
     
  4. terry1001

    terry1001 Major Poster

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    I do hope that's a joke. Try the tool used for opening bottles and jars which grip all around the circumference without marking it or you might find a small oil filter wrench which has a smooth gripping surface.
     
  5. Ruddles

    Ruddles Engaging Member

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    Hehe - yes, it was a joke. I'm not going to try any tools, just something to improve my grip. I just wanted some indication that it could be opened and wasn't glued in place.

    Cheers!
     
  6. terry1001

    terry1001 Major Poster

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    Thank heavens for that :D. The strap wrenches I mentioned should help you get a good grip without causing any damage. I think the difficulty depends on whether the loctite fairy was in the factory when your scope was assembled, good luck with it.
     
  7. neiled

    neiled Donator

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    Won't opening it up release all the gas inside?
     
  8. Ruddles

    Ruddles Engaging Member

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    The gas will be behind the objective lens: I'm only going to screw the lens in/out slightly. Whatever happens, any opening I create won't be large enough to allow the nitrogen inside to mix freely with the air outside. The gas inside isn't pressurised as far as I'm aware... is it?
     
    Last edited: Jan 25, 2014
  9. terry1001

    terry1001 Major Poster

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    Most people don't seem to have any problems but it's worth doing it slowly just a 1/4 turn at a time. I expect the nitrogen is slightly pressurised but it won't be much.
     
  10. Patrick

    Patrick Donator

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    Go to a good photographic dealers,you can buy filter wrench which is used to remove filters from the front of camera lenses without damaging them or the lens
     
  11. Ruddles

    Ruddles Engaging Member

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    Okay, first of all, thanks for everyone's replies. Unfortunately I haven't made any progress so before I wreck the scope, please can I check I'm pulling and pushing the right bits?

    Should I be trying to twist A and B in opposite directions (which is what I've been doing) or is there something inside where the C arrow is pointing that I should be trying to loosen?

    scope.jpg

    Thanks in advance!
     
    Last edited: Jan 31, 2014
  12. jjones

    jjones Well-Known Member

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    for my 3-9x40, I held onto A, twisted B anti clockwise. This unscrewed the end cap - but - the lens is still connected to B (with Loctite I think), so I can now adjust my AO by simply turning B until it focuses. This is not 100% ideal as it is not "locked" into a position and is a nit looser than a normal AO adjuster, but it works and I can focus down to 8 yards with no parallax!!

    The "proper" procedure (I believe) is:

    Hold A, turn B anti clock wise.
    This will loosen the locking ring (B is the locking ring).
    Now if you look in at C you will see 2 cut outs on the metal that holds the lens opposite each other. You should be able to spin C using these 2 points as "lugs" for a tool (I have heard of people chopping bank cards to fit) - be careful as it is easy to scratch the lens.
    Once happy with position of C, tighten B to hold it all in place.
     
    Last edited: Jan 31, 2014
  13. Ruddles

    Ruddles Engaging Member

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    Well give the man a coconut! A and B came apart exactly as described and the objective refocuses, but I'd love to spin the little ring with the lugs cut into it...

    Okay then, let's see how it goes! :)
     
  14. JD

    JD Donator

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    Hopefully part C will not spin, but just turn when you apply light pressure.

    Part C it should be a fairly firm fit.
     
  15. Ruddles

    Ruddles Engaging Member

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    I made a tool to fit the notches in Part C bit it won't move. I'm giving up for now.

    Thanks for everyone's suggestions.

    :(
     
  16. SteveO

    SteveO Top Poster

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    wrap some self amalgamating tape around the lock ring, if you're a man it will unscrew, if you're a girl you will need a constrictor plumbers aid tool.
     

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