Lately I have had success in shimming loose grips at the top with thin nitrile rubber (about 1/32) which is available from many sources and chemically fairly inert.
On the bottom, on shooters I use rubber o-rings from Ace Hardware. On collectibles that require a tighter grip at the bottom I make my own washers out of 1/32 walnut which requires a bit of care but are invisible on the pistol.
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