[Austin W Hogan]

Parker hammers are usually "a light drive fit" ie each hammer must be tapped into place, and should not fall off (quickly) if the hammer screw is lost. I have snugged up wobbly hammers with a tap of a center punch about 1/32 inch from the edge of the broached square hole. Sometimes a tap on opposite sides is required. There should be visible clearance between hammer back and lock surface when the hammer is fully seated.

Best, Austin