Hammer sideplate tightening mechanism

A hammer assembly comprising:

• a first sideplate defining a first side aperture;
• a second sideplate defining a second side aperture;
• a powercell assembly disposed between the first sideplate and the second sideplate defining a bore extending through the assembly that is in communication with the first and second side apertures, the assembly also defining an access aperture that is in communication with the bore;
• and
• a tightening mechanism operationally associated with the first and second sideplates, said mechanism being configured to tighten or loosen the sideplates around the powercell, the mechanism being disposed in the bore of the powercell assembly;
• wherein the tightening mechanism includes a first draw member, a second draw member and a tensioning member interfacing with the first draw member and the second draw member;
• the first draw member includes a flange and a shaft defining a first aperture and including left handed internal threads disposed in the first aperture,
• the second draw member includes a flange and a shaft defining a second aperture and including right handed internal threads disposed in the second aperture, and
• the tensioning member includes a first end portion including right handed external threads mating with the right handed internal threads of the second aperture of the shaft of the second draw member, a second end portion including left handed external threads mating with the left handed internal threads of the first aperture of the first draw member, and a center drive portion disposed between the first and second end portions being positioned in the access aperture;
• and
• the flange of the first draw member and the flange of the second draw member are flat plate portions and at least one of the first side aperture and second side aperture define a first anti-rotation feature and at least one of the flange of the first draw member, the flange of the second draw member, the shaft of the first draw member and the shaft of the second draw member includes a second anti-rotation feature mating with the first anti-rotation feature, the first anti-rotation feature being a keyway and the second anti-rotation feature being a key extending from the flange of the first draw member or the flange of the second draw member.