British Military Chronograph WWII watch 1/5 T. P. VENUS 170 For Repair + Parts

This is a British military chronograph that needs a repair. Watchmaker had been working on this a while. Final thoughts from him prior to returning. For what it's worth, my final thoughts on the Venus are that is IS a gear train issue, stopping the power getting through from the mainspring - although it could be the mainspring/barrel itself. When it was stopped fully wound I forced the crown and it ran, so that suggests that something is stopping the power getting through the gear train to the escapement. Weird though because when it ran it ran very well. However, after removing and replacing all the chronograph works 5 or 6 times to try and diagnose the cause I kind of lost heart, but maybe someone else can pick that up and figure out the problem.

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