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Posted

I bought this watch non running. Took it apart and did my thing and everything is fine except for the Chrono second hand. It resets to a different position almost every time. No matter where the second hand resets to, the minute hand turns after it has been running for exactly a minute.  At first I thought the second hand was loose, so I reset it and put it on as firmly as I could.  Think this is still the problem?  Should I try to sightly tighten the hole on the second hand? Is there something else I should look for?  Photo is where the second hand reset this last time. Thank you 

IMG_20211008_142149192.jpg

Posted
14 hours ago, easj369 said:

No matter where the second hand resets to, the minute hand turns after it has been running for exactly a minute.  At first I thought the second hand was loose, so I reset it and put it on as firmly as I could

Did you use a staking tool to support the chronograph runner from below? There's quite a bit of 'play' so you might not get the hand to fit correctly without support to lift the runner arbor to grip the hand.

 

Posted

Like Plato said you definitely want to support the lower pivot when pressing on.

 

It could be the tube is split, it could be the tube is loose in the hand, and very rarely, the arbor is loose in the chrono runner. Or it's just not tight enough/ pressed on enough.

Posted
1 minute ago, quantieme said:

i have had this problem 3 times in different watches and all 3 times the fault has been the chrono hand is loose on the pipe.

actually just remembered the first 2 times it was a loose hand on the pipe, the last one was on a Breitling and it was that the chrono hand had come loose on the arbor.

Posted
2 hours ago, Plato said:

Did you use a staking tool to support the chronograph runner from below? There's quite a bit of 'play' so you might not get the hand to fit correctly without support to lift the runner arbor to grip the hand.

 

No I didn't. I'll give that a go today. Thank you 

Posted

Most common reason in my experience is a loose seconds hand tube. I prefer to tighten in a lathe collet these days for a more even closure. To prove if it’s loose, flyback several times at around 25 seconds past, and also also 35 seconds past and see if the error is similar for both cases……

Posted

Well, after about an hour of aggravation I do believe it is the second hand itself.  I'll try to crimp it a little bit and see what happens before finding another. Thank you for all of the suggestions.

Posted
18 minutes ago, rodabod said:

Most common reason in my experience is a loose seconds hand tube. I prefer to tighten in a lathe collet these days for a more even closure. To prove if it’s loose, flyback several times at around 25 seconds past, and also also 35 seconds past and see if the error is similar for both cases……

 I actually did that to see what would happen. I could get the second hand in the correct position by swinging it back at certain times.

Posted
12 hours ago, easj369 said:

 I actually did that to see what would happen. I could get the second hand in the correct position by swinging it back at certain times.

Yes, a lose seconds hand tube is a common problem on chronographs. So they have to be such a tight fit as mentioned above.

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