Before the integration of the swivels, the swivel stack support (thick plate located onto the manifold winch deck) must be machined 
After integration of the swivel stack and completion of the driving system, a (3rd) final rotation test shall be performed. The purpose of this rotation test will be to record final turret resisting torque (with swivels installed) and to check for any interference between the fixed and rotating part of the turret

Before the integration of the swivels, the swivel stack support (thick plate located onto the manifold winch deck) must be machined
After integration of the swivel stack and completion of the driving system, a (3rd) final rotation test shall be performed. The purpose of this rotation test will be to record final turret resisting torque (with swivels installed) and to check for any interference between the fixed and rotating part of the turret