A core adjuster assembly includes an adjuster body having a pin engagement end and a locking end. The adjuster body has a central longitudinal bore and a lock cavity formed through an outer peripheral surface. A slider body is formed on an end of a rod and is disposed in the central longitudinal bore of the adjuster body. A primary lock member is disposed in the lock cavity and is moveable from a shipping position to a locked position. A secondary lock member is associated with the adjuster body and the primary lock member and is adapted to maintain the primary lock member in the shipping and locked positions.