Found this on ebay and all I can say is it works and fixed the accuracy amnesia of a 1077. Fit perfectly, well made.
https://www.ebay.com/itm/203927697922?mkcid=16&mkevt=1&mkrid=711-127632-2357-0&ssspo=rWSXGmTXREu&sssrc=2349624&ssuid=ta2s5yd2tp2&var=&widget_ver=artemis&media=COPY
https://www.ebay.com/itm/203927697922?mkcid=16&mkevt=1&mkrid=711-127632-2357-0&ssspo=rWSXGmTXREu&sssrc=2349624&ssuid=ta2s5yd2tp2&var=&widget_ver=artemis&media=COPY