I haven't had time to work on these for awhile but I had some time today.  I messed up on the self nocks I did so I cut them off and redid them.  The tile saw i used was too wide for the string on the bow I am making these for so I went back to the way I usually make self nocks.  
I use two hack saw blades taped together to cut the initial slot.  I cut to the depth of the blade.

I used a drill bit to round out the bottom of the slot.

I use a triangle file to open up the top of the slot.

I then used a small file to open up the slot so the nock just slides onto the bow string.  I actually tested it this time as I worked on the nocks.  

I then cleaned everything up with sand paper to get nocks that snap onto the bow string.  I am happier with these nocks.
