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info on using a peep/apeture sight needed.

Discussion in 'Vintage collectable airguns' started by Deejayuu, Mar 29, 2014.

  1. Deejayuu

    Deejayuu Donator

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    Trying to replicate an antique BSA 21a sight which is going quite well, after a couple of false starts, considering basic hand tools/skills and never seen one in
    hand.
    The elevation/windage adjusters are altered by ingenious, to me, opposing co axial threads so one turn moves the sight two thread pitches.
    Other similar sights use a single thread
    So what I'd like to know;
    i) Is the windage outer thread RH and inner LH ? Not sure looking at photos
    ii) Does it make a lot of difference to the shooter if a single thread is used which may need more turns to achieve the same travel?

    Thanks for looking.
     
  2. terry1001

    terry1001 Major Poster

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    This type of sight works well for precise shooting as long as you have the appropriate front sight element for your targets, it gets your eye in the right place as you have to look through a small aperture.
    The type and pitch of the adjusting screws is not important but you need to have a fine adjustment of the sight and it needs to be consistent over the whole length of travel. With a bit of maths you can work out what sort of pitch you need to get a sensible movement of the rear sight. The ones that I have used (on 22lr and full bore target rifles) have had click adjusters and a vernier type scale for both windage and elevation, they also had spring loading to keep the sight element hard up against the adjusting screws. In fact I sold a couple of Parker Hale versions last year and they fetched quite good money.
    I'm not familiar with the specific sight model you're referring to but I would imagine that making one from scratch is difficult so I wish you luck with it.
     
  3. Deejayuu

    Deejayuu Donator

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    Thanks Terry. When it's done I may feel a thread coming on!
     
  4. terry1001

    terry1001 Major Poster

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    left or right hand?
     
  5. Deejayuu

    Deejayuu Donator

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    Ha! that's the question you didn't answer :confused:
     
  6. Deejayuu

    Deejayuu Donator

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    Having looked properly the windage is LH outer so now what about elevation screws?
     

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