The invention relates to an expandable device adapted to forcibly separate spaced components having generally parallel opposed surfaces defining a cavity therebetween, the expandable device having a jaw assembly with a pair of opposing jaws and actuating mechanism for opening the jaws, the actuating mechanism including a separating member configured to be driven between the jaws so as to push apart the jaws such that the jaws are openable between a contracted configuration where the jaws are receivable in the cavity to an expanded configuration where the jaws are forced apart by the actuating mechanism such that the outwardly directed surfaces of the jaws are engageable with the opposed surfaces and exert oppositely directed forces thereon. The invention also relates to an apparatus configured to carry at least one the expandable device, and an assembly comprising two of the apparatus.