The IMCO Gimbal Housing uses a thicker than stock casting. The IMCO helmets have been beefed up in all critical areas - including the pin locations that are prone to failure. The IMCO Gimbal lower swivel pin is 40% stronger than original. The IMCO Gimbal has a removable bearing pack for easy maintenance. The IMCO Gimbal nameplate can be simply unscrewed for access to the upper swivel shaft nut, without removing the housing from the transom. IMCO rings are designed with additional mass to increase strength, reliability and side load strength. IMCO stainless steel hinge pins and upper swivel shafts are included with HD rings.