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T ended mainspring

LiamB

By LiamB
in Watch Repairs Help & Advice

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LiamB Member

LiamB

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What is the best way to fit a t ended mainspring? I find them quite tricky to get in. Does anyone know any special tricks? And, is the method different when using a mainspring winder and when fitting a new spring still secured by ring. 

Thanks very much, 

Liam

 

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JohnR725 Distinguished Member

JohnR725

Posted
Posted

to insert a T end mainspring you need a mainspring winder. If it's in the ring it has to come out it can only be done with a winder. You wind the mainspring into the winder leaving little bit out. Then wording is going to suck for how to do this. Insert the end of the mainspring in the barrel first followed by the winder itself. Then you should end up with something like in the picture the winder and the mainspring in the barrel. Then you rotate the winder until the T is over the hole or slot. then press it into the opening verify on the other side that it is in the opening. Then before pushing the spring out you need to hold the T end down. You can either use the end of your tweezers or I usually use the largest screwdriver I have. If you hold the T part down into its opening now you can push the whole mainspring out it will stay where it is supposed to be. 

Mainspring-t-end.JPG

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