Here is how I set the angles;
First I put a screw through the front of the base board and the board for the point taper to act as a pivot. I measured and marked the correct angle to give me a line starting point, ran a test taper and fitted the shaft into an uncleaned new point. I could see the black from the inside of the dirty point didn't touch the whole taper. I swiveled and angle board slightly and did another test taper, better but still not a perfect color transfer. One more adjustment and I had it perfect, a complete color transfer from one end of the taper to the other.I put a screw in the back of the board to lock it in position.
I repeated the same steps with the nock taper board. This time I felt for any wobble in the nock. I could tell when I had a perfect fit and locked the top angle in place.
Because I had the boards a little out of square after shifting them around I pushed the jig through the sanding disc to square things up. The piece in the miter slot made this adjustment easy.
I first put a roll pin in each board for a shaft stop but found they were unnecessary and removed them. I can eyeball the taper length and have it almost perfect, don't need a stop. Without a stop you can taper any size shaft perfectly, just push a 5/16th shaft in a little deeper than you would a 11/32nd.
With the jig set in the miter slot you can move it up or back to use a different part of the sanding disc when one place get gummed up.