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Use hardened tool steel, not a Chinese punch, or you'll have shrapnel everywhere.
I use a Craftsman steel punch that I bought as part of a set. You have to re-grind the tool edge at least once.
Yes, you have to really whack them to get them started. Walk them out from side to side, do not let the race start to turn.
The heating/ freezing thing is for guys who use Dremel tools (hobbyists). I like to press them in first using a bearing race tool to tap the race most of the way in, then finish with a hydraulic press, to make sure that the race is fully seated all the way around.
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