Abstract: An angle adjustment unit for mounting a disintegrator head to a support is disclosed comprising a first housing adapted for mounting to the support and a second housing adapted for receiving the disintegrator head. A nut including a nut body and an expanded portion is mounted to the second housing with the nut body journaling a housing aperture in the second housing and with the expanded portion engaging the second housing. A threaded member having external threads extends from the first housing. The nut is mounted on the threaded member for producing a frictional engagement between the first and second housings upon rotation of the nut in one direction to prevent relative rotation therebetween and for removing the frictional engagement between the first and second housings upon rotation of the nut in the opposite direction to enable relative rotation between the housings.