A taper on one side gives asymmetric damping. (lighter on rebound, or vice versa) Which feels funny when used on the front end of a 2WD.
On the rear, light bump and heavy rebound damping keeps the rear end planted, but makes it more difficult to get jumps right.
After a bazillion experiments, I'm still not sure whether it's a good thing to have tapered or chamfered holes or not. All I know is that it's NOT good to mix them with normal, straight holes.
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