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First, assure you don't have to peen too much. That's to say have your holes tight and ad just a bit of taper at the rim.
Second, select your pin material among the softer ones (410 stainless or nickel silver/brass) and don't leave too much too peen if you don't want to work harden it before filling the taper
Last, a thousand of light deliberate taps are way better than a few hard hammering.
Pratice on a disposable slab to get a feel for the process and the point of failure
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