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تويتر \ coopertom على تويتر: "I found the culprit! A cracked optical encoder disc. This is why my Logitech g27 steering wheel is losing calibration http://t.co/Kvpyejyf3e"
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How to fix broken Logitech G27 or G25 optical/rotary encoder for 10 cents - YouTube
Optical Encoder 30 Slot for Steering Wheel Logitech G27 / new Driving Force GT | eBay