Fitting a new hand should fix the timing issue. Look at the tip of the extractor while thumb piece is pressed forward. Does the center pin come flush or a little past the end of the knob? If not the tip of the ejector rod may need just a bit of dressing down so that the center pin comes just past flush. Also, does the pin in the lug under barrel move easily. Might be a bit gummed up and making it hard to go all the way forward.