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  1. #11
    Join Date
    Aug 2013
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    1,557
    Country: Wales

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    They sure can get a hammering during use. Once it all starts to wear slightly the guide hole up the end of the kromer keys gradually closes over from hitting the drill-pin in the lock, making the keys progressively tighter to engage and turn.
    It was a regular job to run a reamer up the end of the keys to keep them working smooth, also cleaning the guide slot down the side of the lafette shaft.

  2. #12
    Join Date
    Aug 2013
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    1,557
    Country: Wales

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    Talking of Tangentialís, imagine what this little lot would be worth...
    Click image for larger version. 

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    This is what I imagine Brian Mís kitchen table looks like

  3. #13
    Join Date
    Nov 2014
    Location
    Bulgaria
    Posts
    686
    Country: Bulgaria

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    It must be a strong table!

    How much reaming would they stand? Eventually they must have needed replacing?

  4. #14
    Join Date
    Aug 2013
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    1,557
    Country: Wales

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    The reamer was only cleaning out the end of the bore where it was starting to close over, a sharp angled csk from a lathe centre drill also helped. there’s also the risk of damage from heavy handling/repeated dropping of keys but even then, reaming the pipe only removes a tiny skim- the raised/projecting metal and no more. Modern locks like Mauers and Stuvs with pipe keys are no different. It was other issues with the protektor locks that saw most replaced in the end.

  5. #15
    Join Date
    Nov 2014
    Location
    Bulgaria
    Posts
    686
    Country: Bulgaria

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    OK. I was thinking about some of those old, worn pipe blank keys that were paper thin and sharp as a razor.

  6. #16
    Join Date
    Aug 2013
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    1,557
    Country: Wales

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    Quote Originally Posted by Chubby View Post
    OK. I was thinking about some of those old, worn pipe blank keys that were paper thin and sharp as a razor.
    everyone else was discussing Kromer Protektors being used with Lafettes

  7. #17
    Join Date
    Nov 2014
    Location
    Bulgaria
    Posts
    686
    Country: Bulgaria

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    I am sorry, I did not express myself clearly.

    Reading this thread reminded me of how sharp a hollow keycan get. I wondered if the reaming process caused sharpness over time.

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