All I use is brass nock points. I invested in a very good pair of nock pliers, years ago. I put my nock point where I want it & lightly crimp it on. Then I double check it with a bow square, and give it a final squeeze.
The pliers do bugger up the nock point some. To fix this, I take 2 small pieces of masking tape wrap them around the serving, above & below the nock point. Then, I use an emery board to lightly sand the rough edges off of the nock point. Once I'm done, It never moves (unless I want it to) and it stays in place for the life of the string. (usualy several years)
Just one old woodchucker's thoughts.....