I was on a roll so I figured today was the day to remove the new ignition cylinder and have the tumblers from the old one swapped in so the old keys worked and I wouldn’t have to keep 2 keys on the ring. After about an hour the locksmith called and said it’s ready. I got home and installed it. I had checked to be sure the key was operating the little part that goes in and out. But...After it was installed it would only turn backwards to acc. , not forward to the start position. And I knew that the only way to remove it was to get it in the start position. I tried about a hundred times. Then I got a small hammer and after a few light snacks it turned. I pulled it and inspected it. Where the keeper for the tumblers was, it looked like they had used a punch and dented it to hold the keeper in. I filed it smooth and it worked. What a damn relief.