A variable angle locking system comprising a humeral component having an underside at least partially defined by a cavity; a humeral stem couplable to the humeral component; a first washer defining a first through-hole and including a threaded portion; an adaptor defining a second through-hole and having a shelf portion and an elongated second washer, the shelf portion being adapted to be received by the cavity of the humeral component; a spring washer positioned between the first washer and the elongated second washer and defining a third through-hole; and a screw configured to lock the humeral component to the humeral stem at more than one angle relative to a common axis defined by the first, second and third through-holes, the screw including a head portion having helical threads and an elongated shaft portion extending from the head portion.