Just to add to the fun
You need to remember that some CMP rims with "run flat" tires were fitted with a solid bead lock, other words a steel or rubber spacer that completely fills the space between the to tire beads. This makes it impossible to slide the tire bead down away from the outer rim edge. Even some of the power bead breakers have trouble with these, because they are pushing against the two sides of the rim and there is no give. In these cases the it may be necessary to let the machine make several revolutions around the tire which tends to break the hold of the rust. Eventually the rim will start to walk out of the bead.
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