Replace the Click Spring in a Hermle Sprocket Wheel •

Discussion in 'Hints & How-to's' started by shutterbug, May 6, 2015.

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  1. shutterbug

    shutterbug Moderator
    NAWCC Member

    Oct 19, 2005
    Self employed interpreter/clock repairer
    North Carolina
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    #1 shutterbug, May 6, 2015
    Last edited by a moderator: May 9, 2015
    This is a short tutorial to show how to replace a click spring in a Hermle 1151-50 movement. The principle will apply to other Hermle main wheels as well. First, have on hand Timesavers #11617 or #19282 (click springs) and #20106 (lock washer). I had the 11617 in stock, and just cut it a little shorter with a #4 Jewelers saw blade. No temper loss that way.
    To remove the old lock washer, just pry up the tabs with a small screwdriver, and remove it.
    Take the wheel apart, and set the parts aside.
    Remove the old click spring (or what's left of it) by inserting a small punch into the holes on the opposite side and tapping it out.
    Insert the new click spring, being careful to get it on the right side of the click. On this movement, the click pushes up on the tail of the click. Just hold it and tap it into place. Check it for proper tension on the click, and bend it a little if needed.
    Reassemble the wheel, and place the new lock washer in place.
    Use a hollow punch to seat it firmly (but not too tight) against the spider spring.
    You're done! Easy job, and no need to hesitate to do it yourself!

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    Dave T likes this.
  2. David S

    David S Registered User
    NAWCC Member

    Dec 18, 2011
    Professional Engineer - Retired
    Brockville, On Canada
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    Re: How To Replace a Hermle Click Spring

    Nice going SB. I wonder if this should be put in the "how to" section?

    I recently had to replace a spring on a similar wheel, but didn't have a replacement push nut. Actually the original owner had tried to fabric a new spring and broke the push nut getting it off.

    I made a small collar with a set screw to replace the push nut.



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