An assembly comprising: a surgical tool adaptor comprising a distal interface member and a handle (14; 91), said distal interface member comprising a connecting element for connecting to a surgical tool, a central passageway being formed through said distal interface member and said handle (14; 91); and a K-wire connector disposed in said central passageway for receiving therethrough a K-wire, said K-wire connector comprising a locking element for locking the K-wire; and characterised by a clutch mechanism operatively connected to said distal interface member and to said K-wire connector, wherein in a first orientation of said clutch mechanism, said distal interface member and said K-wire connector move together, and in a second orientation of said clutch mechanism, said distal interface member is declutched from said K-wire connector, so that in the first orientation movement of said handle (14; 91) moves said distal interface member and said K-wire connector together, and in the second orientation said distal interface member and said K-wire connector move independently of each other, wherein said clutch mechanism comprises a first ratchet mechanism operatively connected between said distal interface member and said handle (14; 91), which in a first direction causes said distal interface member and said handle (14; 91) to move together and in a second direction declutches said distal interface member from said K-wire connector, so that in the first direction movement of said handle (14; 91) moves said distal interface member and said K-wire connector together, and in the second direction movement of said handle (14; 91) moves said distal interface member without moving said K-wire connector; an adjustment knob operative to move said K-wire connector independently of said first ratchet mechanism; and a second ratchet mechanism operatively connected between said adjustment knob and said handle (14; 91), which in the first direction declutches said K-wire connector with respect to said adjustment knob, and in the second direction causes said adjustment knob and said K-wire connector to move together, so that in the second direction movement of said handle (14; 91) moves said adjustment knob and said K-wire connector together. a surgical tool adaptor comprising a distal interface member and a handle (14; 91), said distal interface member comprising a connecting element for connecting to a surgical tool, a central passageway being formed through said distal interface member and said handle (14; 91); and a K-wire connector disposed in said central passageway for receiving therethrough a K-wire, said K-wire connector comprising a locking element for locking the K-wire; and characterised by a clutch mechanism operatively connected to said distal interface member and to said K-wire connector, wherein in a first orientation of said clutch mechanism, said distal interface member and said K-wire connector move together, and in a second orientation of said clutch mechanism, said distal interface member is declutched from said K-wire connector, so that in the first orientation movement of said handle (14; 91) moves said distal interface member and said K-wire connector together, and in the second orientation said distal interface member and said K-wire connector move independently of each other, wherein said clutch mechanism comprises a first ratchet mechanism operatively connected between said distal interface member and said handle (14; 91), which in a first direction causes said distal interface member and said handle (14; 91) to move together and in a second direction declutches said distal interface member from said K-wire connector, so that in the first direction movement of said handle (14; 91) moves said distal interface member and said K-wire connector together, and in the second direction movement of said handle (14; 91) moves said distal interface member without moving said K-wire connector; an adjustment knob operative to move said K-wire connector independently of said first ratchet mechanism; and a second ratchet mechanism operatively connected between said adjustment knob and said handle (14; 91), which in the first direction declutches said K-wire connector with respect to said adjustment knob, and in the second direction causes said adjustment knob and said K-wire connector to move together, so that in the second direction movement of said handle (14; 91) moves said adjustment knob and said K-wire connector together.