Also the foresight has been cropped. Should be readily available but make sure you replace it like for like as they come in a centre, left or right.
As for the extractor not returning................ I suggest you buy and read a little pink covered Skennertonbook about these revolvers. You'll also learn a lot more too. These things were finely tuned and you need to........... anyway, even though I've done many hundreds of them, I couldn't even start to explain on a sheet of paper. But I think you'll find that if you flick it hard...., like you mean business, the extractor will retract at the end of the break cycle
I forgot to add but during the 60's, we used to file the top overhang of the left grip flat and polish it so that it was easier to get to and operate the barrel catch with your thumb