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Heuer 1960's Heuer Triple Date Chronograph Calibre Valjoux 723

the winding stem has broken off inside the crown

cutting a sink to hold the crown in plastic

CAD drawing for the sink

we now have a nice sink that will hold the crown, so that we can mill out the broken winding stem

drilling a 0.3mm guide hole

the guide hole is perfectly centered

next step is 0.5mm

with the 0.9mm mill, the old thread comes out

and we can fit a winding stem!

the pendant tube got bent, and I re-shape it