Put them carefully on a mandrel in a dremel and just touch the upper and lower edges with some 600 grit wet n dry. Be careful not to reduce the overall diameter - you're aiming to just chamfer / radius the square edges.
If you have an old Losi piston - use that as a visual guide to determine what the radius should look like.
IMO it just helps the small bump performance and helps make the shock a little more active on our types of track.
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