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The BMW tool (copies are available through specialist tool stores and online) bolts in place of the idler pulley and clamps the harmonic balancer by the cutouts in the inner ring.
I've managed to get the bolts free by using the serpentine belt as a strap wrench or an air impact gun (engine was on a stand). You could also counter hold it using one of the remaining 4 bolts (rarely works) or remove the starter and have an assistant jam the flywheel with a prybar.
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