[tamathumper]

Pay particular attention to the "Pre-Load Idler", where it says 0-1mm.

That is the amount of deflection the idler should cause to the belt, and not the amount of clearance, so that idler should just be touching or slightly deflecting the balance shaft belt when properly adjusted, and .5mm off the belt/idler assembly below it.

I usually tuck a credit card under it to set that clearance, then I can just focus on the top one.