mainspring replacement to a Longines 18.69Z

[Don Dahlberg]

Jonny,

Did you find an answer to your problem? If not, perhaps we can help you calculate the dimensions of your mainspring.

Let of know if you would like to try this.

Don

[J.C.]

See this post...to calculate missing mainspring

old ref::http://nawcc-mb.infopop.cc/eve/forums/a/tpc/f/4316035461/m/4581098901/r/8851053111#8851053111

Simple solution for missing springs.

good luck

j.c.