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This video from Cobb R&D shows the Focus ST's engine wiggling about wildly with the sloppy stock RMM bushings - Ford decided it would be cheaper to use the same RMM as non turbo Fiesta and Focii, so thus we're saddled with this issue.
This is why replacing the bushings with either the PowerFlex ones - or installing the COMING THIS MONTH Cobb Rear Motor Mount for Fiesta is such a good idea.
While the video shows you what happens with a Focus, this makes it visually clear why this is such a "Must-Do" upgrade.