A locking assembly for releasably locking a shroud to a carrier, wherein the locking assembly comprises: a piston, a main body provided with a through central recess for receiving the piston such that the piston is movable back and forth along a longitudinal axis of the recess with an outer end portion of the piston extending outside the central recess of the main body, wherein the locking assembly further comprises a bolt provided within the central recess, wherein the bolt comprises a shank and a gripping portion extending through a first end opening of the central recess such that the gripping portion is accessible from outside the main body for rotation of the bolt, wherein at least a portion of the shank is provided with a thread engaging a corresponding thread of the piston, wherein the bolt is provided with a first bearing surface facing a corresponding second bearing surface of the main body, wherein the first and second bearing surfaces are configured such that when the bolt is rotated to force the piston out of the central recess, the first bearing surface of the bolt bears against the second bearing surface of the main body thereby preventing movement of the bolt in a first direction along the longitudinal axis, wherein the locking assembly further comprises a retaining means for preventing movement of the bolt in a second direction opposite the first direction, wherein the retaining means is provided in the central recess with an outer surface of the retaining means facing an inner surface of the central recess, wherein the outer surface of the retaining means is provided with a first recess extending at least partly around the circumference of the retaining means, wherein the inner surface of the central recess is provided with a second recess extending at least partly around the circumference of the inner surface of the main body, wherein the first recess and the second recess jointly define an intermediate space for receiving a plurality of balls distributed about the longitudinal axis such that the balls limit movement of the retaining means in the second direction relative to the main body, and wherein the retaining means is either a) integrated with the bolt, or b) provided as a separate part positioned around the shank of the bolt and adapted to limit movement of the bolt relative to the retaining means in the second direction. a piston, a main body provided with a through central recess for receiving the piston such that the piston is movable back and forth along a longitudinal axis of the recess with an outer end portion of the piston extending outside the central recess of the main body, wherein the locking assembly further comprises a bolt provided within the central recess, wherein the bolt comprises a shank and a gripping portion extending through a first end opening of the central recess such that the gripping portion is accessible from outside the main body for rotation of the bolt, wherein at least a portion of the shank is provided with a thread engaging a corresponding thread of the piston, wherein the bolt is provided with a first bearing surface facing a corresponding second bearing surface of the main body, wherein the first and second bearing surfaces are configured such that when the bolt is rotated to force the piston out of the central recess, the first bearing surface of the bolt bears against the second bearing surface of the main body thereby preventing movement of the bolt in a first direction along the longitudinal axis, wherein the locking assembly further comprises a retaining means for preventing movement of the bolt in a second direction opposite the first direction, wherein the retaining means is provided in the central recess with an outer surface of the retaining means facing an inner surface of the central recess, wherein the outer surface of the retaining means is provided with a first recess extending at least partly around the circumference of the retaining means, wherein the inner surface of the central recess is provided with a second recess extending at least partly around the circumference of the inner surface of the main body, wherein the first recess and the second recess jointly define an intermediate space for receiving a plurality of balls distributed about the longitudinal axis such that the balls limit movement of the retaining means in the second direction relative to the main body, and wherein the retaining means is either a) integrated with the bolt, or b) provided as a separate part positioned around the shank of the bolt and adapted to limit movement of the bolt relative to the retaining means in the second direction. a) integrated with the bolt, or b) provided as a separate part positioned around the shank of the bolt and adapted to limit movement of the bolt relative to the retaining means in the second direction.