An assembly for mounting a cutter bit on a driven mechanism, the assembly comprising a bit having a bit tip, a bit sleeve including a holding portion adapted to receive the bit, a bore through the holding portion, and a bit holder. The assembly further includes a mounting base having a forward portion and a mounting base rear portion having an internal water passageway in communication with an upper opening for receiving an ignition control unit. The assembly further includes a rear surface having a spray nozzle cavity in the rear surface and open in a rearward direction. The spray nozzle cavity has an internal spray nozzle cavity water passageway-in communication with the mounting base rear portion internal water passageway. The assembly further includes a dust reduction unit including a spray nozzle comprising a base received in the spray nozzle cavity, the base having a spray nozzle base water passageway through the spray nozzle base and in communication with the spray nozzle receptacle water passageway. The dust reduction unit further includes a spray orifice in communication with the spray nozzle base water passageway, and a mechanism for connecting the spray nozzle to the mounting base rear portion.
