A turbine assembly comprising: a rotor wheel; a circumferential slot formed in the rotor wheel, the circumferential slot comprising a uniform cross-section shape for a circumference of the rotor wheel; a first plurality of ring members positioned in the circumferential slot, the first plurality of ring members being configured to prevent radial movement of a dovetail attachment when positioned in the circumferential slot, wherein the dovetail attachment is part of a turbine blade; the first plurality of ring members defining at least one opening between the first plurality of ring members, the at least one opening configured to receive the dovetail attachment in a radial direction before circumferential sliding of the dovetail attachment to fix the position of the dovetail attachment in the circumferential slot; a second plurality of ring members positioned in the circumferential slot, the second plurality of ring members configured to prevent radial movement of the dovetail attachment when positioned in the circumferential slot, the second plurality of ring members defining at least one opening between the second plurality of ring members, the at least one opening configured to receive the dovetail attachment in the radial direction before circumferential sliding of the dovetail attachment to fix the position of the dovetail attachment in the circumferential slot; characterised in that the turbine assembly further comprising: a locking member configured to be placed in the circumferential slot before a closure blade is placed in the circumferential slot, wherein the locking member is configured to radially extend via a screw to lock a position of the closure blade and at least one of the first plurality of ring members relative to the circumferential slot. a rotor wheel; a circumferential slot formed in the rotor wheel, the circumferential slot comprising a uniform cross-section shape for a circumference of the rotor wheel; a first plurality of ring members positioned in the circumferential slot, the first plurality of ring members being configured to prevent radial movement of a dovetail attachment when positioned in the circumferential slot, wherein the dovetail attachment is part of a turbine blade; the first plurality of ring members defining at least one opening between the first plurality of ring members, the at least one opening configured to receive the dovetail attachment in a radial direction before circumferential sliding of the dovetail attachment to fix the position of the dovetail attachment in the circumferential slot; a second plurality of ring members positioned in the circumferential slot, the second plurality of ring members configured to prevent radial movement of the dovetail attachment when positioned in the circumferential slot, the second plurality of ring members defining at least one opening between the second plurality of ring members, the at least one opening configured to receive the dovetail attachment in the radial direction before circumferential sliding of the dovetail attachment to fix the position of the dovetail attachment in the circumferential slot; characterised in that the turbine assembly further comprising: a locking member configured to be placed in the circumferential slot before a closure blade is placed in the circumferential slot, wherein the locking member is configured to radially extend via a screw to lock a position of the closure blade and at least one of the first plurality of ring members relative to the circumferential slot.