A rotor disc assembly for a gas turbine engine, comprising: a rotor disc, including: a disc body disposed about an axis, a first extension member axially extending from the disc body, the first extension member having a first finger and a second finger circumferentially spaced apart from the first finger, and a second extension member radially spaced apart from the first extension member, the second extension member axially extending from the turbine disc body; and a minidisc, including: a minidisc body that engages the second extension member, and a first extension arm axially extending from the minidisc body, and characterized in that: the first extension arm of the minidisc has an extension finger radially extending from a distal end of the first extension arm, the extension finger is configured to receive a balance weight; each of the first finger and the second finger of the rotor disc extends axially from the first extension member, wherein each of the first finger and the second finger define a notch extending radially in a direction that extends towards the first extension arm; an interlocking finger radially extends from the minidisc body and is disposed between the first finger and the second finger; and in that a first balance ring is at least partially received within the notches of the first and second fingers. a rotor disc, including: a disc body disposed about an axis, a first extension member axially extending from the disc body, the first extension member having a first finger and a second finger circumferentially spaced apart from the first finger, and a second extension member radially spaced apart from the first extension member, the second extension member axially extending from the turbine disc body; and a disc body disposed about an axis, a first extension member axially extending from the disc body, the first extension member having a first finger and a second finger circumferentially spaced apart from the first finger, and a second extension member radially spaced apart from the first extension member, the second extension member axially extending from the turbine disc body; and a minidisc, including: a minidisc body that engages the second extension member, and a first extension arm axially extending from the minidisc body, and a minidisc body that engages the second extension member, and a first extension arm axially extending from the minidisc body, and characterized in that: the first extension arm of the minidisc has an extension finger radially extending from a distal end of the first extension arm, the extension finger is configured to receive a balance weight; each of the first finger and the second finger of the rotor disc extends axially from the first extension member, wherein each of the first finger and the second finger define a notch extending radially in a direction that extends towards the first extension arm; an interlocking finger radially extends from the minidisc body and is disposed between the first finger and the second finger; and in that a first balance ring is at least partially received within the notches of the first and second fingers. the first extension arm of the minidisc has an extension finger radially extending from a distal end of the first extension arm, the extension finger is configured to receive a balance weight; each of the first finger and the second finger of the rotor disc extends axially from the first extension member, wherein each of the first finger and the second finger define a notch extending radially in a direction that extends towards the first extension arm; an interlocking finger radially extends from the minidisc body and is disposed between the first finger and the second finger; and in that a first balance ring is at least partially received within the notches of the first and second fingers.