Bearing Expansion Lock

A bearing expansion lock useful in locking linear axial movement of a push-pull rod driven by a potential energy source, where the push-pull rod is housed in a hollow shaft, is disclosed. A hollow elongated housing is provided to be mounted along an axial dimension of the hollow shaft. A shaft subassembly is received within the housing and adapted to be interposed between an outboard end of the push-pull rod and the potential energy source. The shaft subassembly is reconfigurable between a first position in which the shaft subassembly is braced against slidable movement within the housing along the hollow shaft and a second position in which the shaft subassembly is slidable within the housing along the central shaft. Configuration of the shaft subassembly in the first position restricts movement of the shaft subassembly along the housing, thereby restricting movement of the push-pull rod along the hollow shaft.