The present invention relates to an electrical discharge machining head assembly operatively associated with an electrical discharge machining device for performing electrical discharge machining. The electrical discharge head assembly comprising a bracket configured to snuggly sandwiching a hollow shaft connected to a pneumatic hose at one end, wherein the one end of the pneumatic hose and the hollow shaft is securely fitted by a pneumatic fitting. The present invention further comprises a hollow electrode connected to the another end of the hollow shaft held in place by a pin chuck, wherein the hollow shaft is configured to deliver dielectric liquid through the pneumatic hose to the electrode for use in electrical discharge machining.