In the Apple Service Source manuals (I think) was a reference to an Apple service part, a shim, for this repair. The repair could probably be achieved with a shaped piece of anything, cut from PE milk bottle or sheet builders membrane or some such, that could be used to chock and immobilize the offending ribbon cable.

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(60x) 13DT + 3PB + PTPro; (G3) 7DT/MT; (G4) 3T + PB. System 8.1 to OS 10.5.8