a method of forming a handle connection for an impact tool such as a hammer is disclosed which includes the steps of forming the metallic tool head with a handle - receiving eye in which a portion of the eye spaced from the entrance end increases in cross - section toward the exit end , inserting a non - metalic handle having an end portion within the eye dimensioned to form a tight fit with the entrance end of the eye but having a clearance between it and the portion of the eye which increases in cross - section , said end portion in addition having a peripheral indentation or recess in its outer surface , injecting a tough , hard and rigid molding thermoplastic , preferably glass - filled , into the space between the end portion of the handle and the eye , the plastic being in a heated flowable state and being injected under sufficient pressure to compress the end portion of the handle , and permitting the plastic to solidify while maintaining said pressure whereby the plastic forms a tight mechanical interlock with the handle and has intimate wedging engagement with the portion of the eye of increasing cross - section thus effectively locking the parts against looseness and separation .