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I noticed that my wipers only work near the edges, suggesting the wiper arm spring can't overpower the preload in the wiper blade (RainX Latitude).

Anyone found an easy way to increase the arm spring tension?

A common problem for me too. I tried playing with the spring, also bought new arms. Neither really solved it. Finally just switched to cheaper, poorer quality blades with less pre-load. That works better but not the real solution we'd prefer.