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Whoa! That’s a bit tight

by Jordan Ficklin

Dear Sir or Madam who last worked on that beautiful Hamilton 992b that was on my bench today. I think you may have tightened down the crown wheel screw a bit too tight.

That is a 1.60 mm screwdriver blade that completely cracked in my efforts to remove the screw. It broke after having soaked the screw with Kroil for quite some time. As of now, the crown wheel is still in place.

As a rule of thumb, I was taught that when tightening screws in a watch you should gently turn the screw until it comes to a gentle stop and then turn the screw additionally the equivalent of the width of the slot. This keeps the screw from being too tight or too loose.

2 Comments

  1. Rob
    Posted November 6, 2012 at 8:21 pm | Permalink

    Better than ripping the head off that screw and leaving its threads firmly in place.. That may still happen of course. :)

  2. Posted November 6, 2012 at 9:50 pm | Permalink

    What a great rule of thumb. I’ve never seen anything written, that I can recall, that articulated this so well. “Tight but not too tight” doesn’t stand a chance against your description. Thanks much for the words of wisdom.

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