A rotary cutting tool , having a tool longitudinal axis (A), defining a forward to rearward direction (D F , D R ) and about which the rotary cutting tool is rotatable in a rotational direction (R), the rotary cutting tool comprising a tool holder and a tool body releasably attached to the tool holder at the holder forward end thereof, wherein: the tool holder comprises: a holder peripheral surface extending circumferentially along the tool longitudinal axis (A) and forming a boundary of a holder front surface at the holder forward end ; and an adjustment arrangement comprising a biasing member which is movably attached to the tool holder and comprises a biasing portion ; and the tool body comprises: opposing body forward and rearward surfaces and a body peripheral surface extending therebetween; and a plurality of angularly spaced apart cutting portions , each comprising an insert pocket disposed at the body peripheral surface and configured to retain a cutting insert, the plurality of cutting portions comprising an adjustable cutting portion , wherein the adjustable cutting portion is adjustable between a non-flexed position and a flexed position; and wherein in the flexed position, the adjustable cutting portion is elastically deformed in the forward direction (D F ) due to the biasing portion pushing against the body rearward surface of the tool body . the tool holder comprises: a holder peripheral surface extending circumferentially along the tool longitudinal axis (A) and forming a boundary of a holder front surface at the holder forward end ; and an adjustment arrangement comprising a biasing member which is movably attached to the tool holder and comprises a biasing portion ; and a holder peripheral surface extending circumferentially along the tool longitudinal axis (A) and forming a boundary of a holder front surface at the holder forward end ; and an adjustment arrangement comprising a biasing member which is movably attached to the tool holder and comprises a biasing portion ; and the tool body comprises: opposing body forward and rearward surfaces and a body peripheral surface extending therebetween; and a plurality of angularly spaced apart cutting portions , each comprising an insert pocket disposed at the body peripheral surface and configured to retain a cutting insert, the plurality of cutting portions comprising an adjustable cutting portion , wherein the adjustable cutting portion is adjustable between a non-flexed position and a flexed position; and wherein in the flexed position, the adjustable cutting portion is elastically deformed in the forward direction (D F ) due to the biasing portion pushing against the body rearward surface of the tool body . opposing body forward and rearward surfaces and a body peripheral surface extending therebetween; and a plurality of angularly spaced apart cutting portions , each comprising an insert pocket disposed at the body peripheral surface and configured to retain a cutting insert, the plurality of cutting portions comprising an adjustable cutting portion , wherein the adjustable cutting portion is adjustable between a non-flexed position and a flexed position; and wherein in the flexed position, the adjustable cutting portion is elastically deformed in the forward direction (D F ) due to the biasing portion pushing against the body rearward surface of the tool body . <EOS>