Abstract: An impacting tool, such as a jackhammer or electric hammer is proposed to be modified by a high modulus polymeric material, or metal of lower relative modulus than surrounding metal such as that of a piston. An interchangeable tool head is proposed to have inserted in a cavity in the impacted end such a high modulus polymeric material. Thus the term relatively lower modulus inclusion (“RLMI”) has been selected for the descriptive term. By using such relatively lower modulus material for an inclusion, which inclusion can be an insert, and modification of the piston or ram or impacting end of the tool, and additionally, if desired, the stop end of the piston or ram, the invention enables reduction of noise and vibration without substantially diminishing impact effectiveness and working time. Additionally, the working end of a cutting or impacting tool can be modified to a sharper angle because of diminished force through such relatively lower modulus inclusion.