A shaft assembly (14) for a tool comprises a first shaft part (26) and a second shaft part (28) and is adapted to be arranged between a handle and a working head of the tool. The first shaft part (26) is slideable and/or rotatable within the second shaft part (28), pin means (62) is trapped within the first shaft part (26) and adapted to engage with co-operating receiving means in the second shaft part (28) and clamp means is provided to secure the second shaft part (28) relative to the first shaft part (26). <IMAGE>