Lemania chrono help

Need some help with a watch a customer gave me, the movement in the watch is a lemania 5100 1341, the time side of the watch works perfectly but have an issue with chrono side. The chrono start button works but the stop/reset does not. I've found 1 issue,their should be a pin poking up through the hole which I've marked in the picture which is triggered by the pusher, it has snapped off by the look of it. What would this part be called and where would be best place to look for watch parts for this make of movement. I know these movements were held in quite high regard and used in omega and other high end watches so would be a shame to not try and fix it. If I can't fix or get it fixed I can still use it as just a timepiece, I'm in tewkesbury,gloucestershire,UK and don't know any watch repairers so any recommendations would be appreciated if I decide to go that route. Thanks 😊

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Marshall