click spring for Omega 18LPB pocket watch

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Currently, I'm in the process of making a click spring for this Omega pocket watch movement. However, I'm a little stuck.
Does someone know how that spring should look like?

 
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If you take off the click, is there a small hole in the underside?
And also a small hole in the barrel bridge under the click?
 
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A very quick search on google with the following words : “omega 18 lpb click spring” lead me to this :