To begin with the tap I used is tappered. I drilled the holes, used a magnet to get metal out, turned sector each way to flush with the fluid inside. Tapped a little, test fit, tapped a little more, test fit again, and so on, till it was what I wanted. magnet again to get out metal, then a good swing on the pitman arm(sector shaft) re-installed and no issues for over two years.
