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The first time I changed my belts (also M750) I marked the position of the belt tensioners by drawing around the locking bolt heads with a sharpie pen.
It serves no real purpose but it does give a certain reassurance when the new belts are fitted and tensioned up, to see that the tensioners are in a similar position to how they were originally.
Also, if you are going to use the allen key method to set the tension, I would definitely recommend having a go on the old belts before you undo anything, to get a feel for how things should be (assuming the old ones are tensioned correctly, which they probably are).
Its very much a subjective method so its good to have a bit of practice first.
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