A hammer support system for a rotary tool has a hammer receiver including a first alignment opening having a first curved alignment surface. A first wedge part has a curved surface, and a second wedge part is configured to interact with the first wedge part. A fastener is provided for drawing down the first wedge part against the second wedge part such that the curved surface of the first wedge part engages the first curved alignment surface to self-align the first and second wedge parts as the first wedge part is drawn down by the fastener.