I know they used to age oak tables, etc by banging w hammers, and also chains.
For smaller items like grips, put in a sock with some fine stones, not too big, double them up and put in dryer, no heat. The banging around should help. You could strip them ahead of time, then put ware on them.
Slower method is to put inloose in a box with smaller tools or perhaps small rocks and put in trunk and drive around for a couple weeks.
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