The first model had a rack and pinion extractor like the Russian, which is where it got the name "Baby Russian." The second model has the type of cam shown, but the one pictured is missing a piece and has the wrong spring. There is a curved part that fits in the front, and has its own pivot built in with a small spring behind it.
I hope the picture comes through OK, but here is what it looks like. Compare it with the one shown by the OP.
So, given that the missing part is probably unobtainable, could the OP make the part work? I think so, but it will take some work on that spring, plus the fix will probably mean that the extractor won't snap back into the cylinder as it should, but it might extract OK.
Jim