How do you measure a mainspring?

[Gun_Nut_73]

Hi all. 

Another newbie question:  How do you measure a mainspring?  I am guessing it is from the anchor pin (if that is the correct term) to the end that connects with the tumbler.

I was recently gifted a Russ Hamm lock that is missing the mainspring, and looking through the DGW catalog, I am seeing all these different lengths, and wondering how to apply the numbers to the lock in hand.

[Hungry Horse]

CVA mainsprings from their Maslin lock fit most Hamm locks.

  Hungry Horse

[jerrywh]

Hi all. 

Another newbie question:  How do you measure a mainspring?  I am guessing it is from the anchor pin (if that is the correct term) to the end that connects with the tumbler.

I was recently gifted a Russ Hamm lock that is missing the mainspring, and looking through the DGW catalog, I am seeing all these different lengths, and wondering how to apply the numbers to the lock in hand.

I would say you are correct but ,you also have to know the total length or it might interfere with the front screw.