Track Clearance

A copper coin stood tilted inside the aluminum sash track. I paced down the painted ledge until my stance straddled the channel. Lowering my right arm cannon, I applied measured forward force against the coin's serrated edge. It broke static friction with a brief rasp, then glided cleanly along the metal groove for twelve centimeters before striking the corner stop with a resonant chime. I monitored the path until the vibration ceased. The corridor is cleared.