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I watched the "Brad the Bike Boy" video out of curiosity.
He uses the Gates app to check the belt tension by measuring vibration frequency but I notice that he makes no mention of which run of the belt to pluck in order to take the reading.
Presumably this would affect the result according to whether you plucked a longer or shorter belt run ....??
Personally, I like to use the allen key method on my 750 as I like the fact that you don't have to rely on an electronic "box of tricks" to give you an answer by some internal "magic".
It does however require the mechanic to have a decent mechanical "feel", which may not suit everyone.
As everyone has said, if you take your time and check your work before starting the motor, belt changes on 2v motors are pretty straightforward and you shouldn't have any trouble.
And I agree, once you're familiar with what to do, removing the belt covers is the trickiest bit.
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