Mrinal Kumar on Instagram: "How Can Cyclists Inflate a Tire When the Pump Head Fails? When a pump head breaks or a valve starts leaking, quick thinking matters more than fancy tools. This clever field trick uses a small stone and a cloth to create an improvised pressure seal over the tire valve. The stone acts as a rigid, focused pressure point, while the cloth works like a temporary gasket-sealing gaps, stabilizing the valve, and preventing air from escaping during inflation or pressure checks.