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Discussion Starter #1
Just seeking some advice on what sort of power reserve members a getting with the Cousins GR2534X mainspring in their 6309 movements.

Trying to trouble shoot a 30 hour power reserve when the spring is wound manually as opposed to 12 hours reserve when on a watch winder or on the wrist.

Do you clean and lubricate the new spring before installing or just install straight from packet?

Any other suggestions besides the GR2534X as a replacement?

Many thanks in advance for any help.
 

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The original springs can provide over 50 hours, with a little over 7.5 turns inside the barrel, from memory. When you wind by ratchet wheel, are you giving it over that amount of turns to start the test? When it stops after 30 hours, have you checked to see how many turns are left in the ratchet wheel, to a completely let down condition?
Start with that before troubleshooting the auto system, as it appears you may have more than one problem.
 

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Also the GR2534X does not need to be lubricated. But you will need the appropriate amount of slipping grease on the barrel wall. Could be any number of problems. One is over oiling the barrel wall and the spring is slipping way to early. When you are loading up the spring in the barrel using a screwdriver how many full turns can you apply before you hear the mainspring slipping?
 

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Discussion Starter #4
Thanks for the information guys.

Will do a bit more investigating regarding your suggestions.
 
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