Tinkerist Nalzie has found a signature on some of the machine parts I brought back to him earlier. I am to look for a goblin named Grizzik and slay him, as he appears to be the main architect for most of the machines being used by the Nurgans. Nalzie believes that I will find him deep within the Mines of Nurga. Once Shamachanic Grizzik is defeated, I am then to place Nalzie's Route-Kit on Grizzik's machine in an effort to disable it, and prevent it from ever being used.
Enter the Mines of Nurga and follow the train tracks down until reaching a large open room containing a wooden structure several stories high, with a wooden ramp going up (end of the tracks). Shamachanic Grizzik is on the ground floor level, in the middle, at loc ( 8, 39, -2172 ) /waypoint 8, 39, -2172. He is a solo 72^.
Right-click Grizzik's machine and opt to place Nalzie's Route-Kit on it. This destroys the machine.