I think between @
curbtender and @
Mad Honk you should be covered, but in case not I checked my damaged patent-74 NR RD and tho there's a good condition part 812/A (with good threads, I checked them) the 812/1A screw is gone. One of the few parts that went, but if it turns out you need the one I got, this is definitely off a RD that's not ever going to be used for anything but spare parts