All it will do though is delay the inevitable...like you've experienced, eventually you are having to replace the shaft for a modified one as the changed hex key just isn't cutting it.
You're right. I've been keeping an eye on it and replacing with the later solid 77mm hex keys when doing an oil change just to help delay it failing. I would hate for it to fail so will get it changed to the 100mm and just mentioned it's been changed when I come to sell the car.
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