a power driven reciprocating hammer strikes a tool shaft or moil . a split ring of larger diameter than the moil extends about a reduced diameter shank portion of the moil and makes contact with a one - piece bushing , through which the moil extends , when the moil approaches its outward end of travel . the bushing is moved against a body of elastomeric material which is housed within a nose cap . such material absorbs the remaining energy in the moil and in so doing changes its shape , including by flowing radially outwardly through an axial space provided between the nose cap and the nose end of the housing . cross pins removably connect axially projecting mounting lug portions of the nose cap to the nose end of the housing .