1. Correctly installed screw.
2. The washer is not properly balanced: one side is tightened too much, while the other side is too loose. This uneven installation can cause sealing issues, increasing the risk of leakage.
3. The washer is over-tightened, causing it to crack shortly after installation. This reduces the effectiveness of the seal and increases the risk of leakage.
4. The washer is mounted too loosely on the panel, resulting in a poor fit. This lack of a secure seal can lead to problems and a higher risk of leakage.
5. The screw is over-tightened, causing a dent in the sheet or panel. This dent allows water to collect in the low spot, increasing the risk of water accumulation and potential damage.