By on March 29, 2019

1988 Mercury Cougar Window Run Channel, Image: Sajeev MehtaTony 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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