•  The tension bolts, pointed from the rear to the front housing, are tightened to fix the housings.

•  Corrugation at the center of the tension bolts prevents resonance.

•  There are two types of tension bolt lengths, with the longer bolts having a hole in the bolt head for differentiating between the two types of lengths.

•  Seal washers have been used to improve the sealing and prevent oil leakage. The No.18 bolt does not have a seal washer.