Take a closer look. If your like most of us, put on your 3x cheaters. That dab of metal that you ground off is the end of the pin that was factory swaged. I can see in your picture a slightly different color where the pin is. Use a slightly smaller pin punch (with a flat face) and back the gear up on a vice opened about 3/8”. You may need a helper to support the distributor so you can use two hands for the hammer and punch. Lightly tap that area with a small hammer and that punch and the pin should reveal itself.
Good Luck!
Last edited by Phak1; 12/19/2019 2:17 AM.