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i agree with John
If you know a good machine shop with a roll peen set up on a lathe you could have them work the shoulder into position where it could time correctly, quite easily actually. Average joe isn't going to get the results needed trying to roll peen it by hand on an anvil.
Thanks, on further inspection, I don’t think it is out as far as I thought. I will look into having it machined. I will let you know how I make out and post some pics.