The Performance Shop may have upset the pin or put it in with Loctite to be sure it doesn't loosen spontaneously. I would call them and ask if they do that. If they used Loctite, it may require heat to remove it.
If a drop of sweat got in one end of the pin tunnel, there could be corrosion holding it. A drop of Gunzilla or Kroil put on the end and allowed to penetrate and sit for a couple of days will loosen something like that.
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