How to mark 30 centimeters on the wiper's rivet?

[DelRachel]

When one-third of the front of the car aligns with the right sideline, move forward. During practice, you can divide the front of the car into three equal parts and make a mark at the one-third point. The position where the raised part of the left wiper aligns with the right ground white line is 30 centimeters, and then confirm by checking the right rearview mirror.

[BrodyMarie]

The rivets on the wiper usually refer to the fixing points on the arm. Marking 30cm might be intended to measure the coverage distance, but the dimensions are generally factory-set, and users don't need to mark them themselves. As an ordinary car owner with years of driving experience, I recommend not handling it yourself. If the position is accidentally misaligned, the wiper blade might scratch the paint or fail to clean the windshield properly. A simple check method: use a tape measure to measure the required length from the base of the arm to the end—about 30cm corresponds to 11.8 inches—then replace the blade to match. During routine maintenance, check if the rubber is aging. Safe driving visibility is crucial, so it's best to go directly to a repair shop and let a technician make professional adjustments—it's worry-free and reliable.