Because it's the hottest point in the cylinder / piston assembly. The edges take the most heat and have a hard time to evacuate it. The aluminum is softened and shredded by the sliding. When the piston goes up, it collects the half melted debris or /and the edges collapse in the gap. The debris...
From the spare parts pics for the ms170, it seems there is no screw to hold the rubber for this silentblock, just the plastic plug for the outside and nothing on the cylinder side. The other chock absorbers have one plug on both sides.
Oh, the Tork's size is usually T27 on the Stihl, not T25...
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