As above. Try the spring loaded center punch again. Dial in the hardest hit if its adjustable. Position the point where you want it and push down until it snaps. Do not move the point and do it again a few more times. You should end up with a nice little circular divot on the end plate that displaces a little metal into the castle nut notch. It won't look like a factory stake job, but will work equally as well. Do it in 2 places on the nut.
Shoot And have fun!
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