Ron, I had a similar problem with the CVK40 screws. I had them almost all the way in and it seemed even a 1/16" turn would screw them up. Could not get them to set right. Went back to the stocks until Don graciously sent me the ones he had made up by a friend of his.
Bryan, the CVK40 screws are just too small (taper) IMO. I was using 42 pilots when I had them in. I would advise against them and advise for getting thumb screws that have the stock taper.
