#WindowRunner

Piston Slap: Stumped by Stumpy Glass Run Channels!

Tony writes:

Sajeev,

This automotive design element has perplexed me for years. What is the small, usually black bump or protrusion on the front window glass run channel of certain cars? The 2010 Nissan Versa has the most obvious one that I have seen recently. Thanks!

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Piston Slap: Stumped by Stumpy Glass Run Channels!

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