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@Chalfie
Bike nerdery ahead.
My gsc-10 appears to be working ok. I have pressed the reset switch. I can hear a click when the wheel magnet goes past the sensor. I can see a light flash. I can see cadence and speed output on trainer road (my garmin 705 is in storage, my edge 200 cannot display these things).
However, while the cadence may stay (relatively) constant, the "power" is going up and down and lagging or not even registering.
I have 2 x rare earth magnets on the pedal and 1 x normal garmin wheel magnet.
I have tried no cadence on pedal and 1 x rare earth + normal wheel magnet on the wheel. The "power" is still going mental/not registering.
Any ideas?