Profile: Custom Metalworks specializes in installation of yagi antennas, arrays and rotating towers. Our products include standard-duty antenna side mounts, heavy-duty antenna side mounts and heavy-duty rotors & thrust bearing plates. Our heavy-duty side mount is designed for larger, long boom yagis and for areas where high winds are an issue. All-welded construction of the side mount makes it extremely rigid and prevents the common twisting problems inherent in bolt-together side mounts made from angle iron.