it's the way you do it without a press normally, and I had it braced around the area I was hammering so it shouldn't have deformed.
I've been trying to use my press but I just can't seem to find a way to make it work the way I want it to. :/ if I had some kind of adaptor so that I could press straight down from the center, but still be pressing it in from the outer rim I'm sure I could make it work..
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