If the sleeve does need to come out then I would simply drill it out. Make sure you don't drill the bracket hole bigger. Simply start with smaller drill bits and increase size. Sometimes even the drilling action will turn the sleeve and loosen it. If you drill the sleeve to very close to the bracket and its still in there, try knocking it out with a punch, chisel, or drift. The thin material left will usually deform and collapse inward where it can be knocked out.
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SIKSUKR
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