a method of manufacturing a bonded metal assembly having a form and a powdered metal - filled plastic member with a cylindrical surface generally surrounding the form includes providing a mold having a cylindrical interior surface corresponding to the cylindrical surface of the resulting powdered metal - filled plastic member and providing a gate to the mold . the gate extends at least partially along a radius of the cylindrical interior surface of the mold . with the form positioned in the mold , a powdered metal - filled plastic material is injected through the gate to the mold and flowed around the form . a resulting bonded metal assembly includes a form and a powdered metal - filled plastic member having a cylindrical surface generally surrounding the form . the powdered metal - filled plastic member includes an injection - molding gate line extending at least partially along a radius of the cylindrical surface .