The movement is cleaned and a new mainspring is ordered based on the measurements of the old one.
I see that the balance moves freely after fitting the shock jewels. No lack of jewels in this movement, being a 25 Jewelled manual wind!
I fit a new setting lever spring and wind the watch. It starts ticking straight away! and it preforms very well and actually has pretty good positional variation readings also.
Now that has to be one of my all-time favourite designs!