A device (10;105) comprises a body (50;135) connectable to a post cap (25;100) of a post driver (1), and a device post cap (55;140) rotatably connected to the body. The device (10;105) is suitable for retro-fitting to a post driver (1) so as to provide a post rotation capability to the post cap (25;100) of the post driver (1). The body (50;155) comprises a first side (85;145) formed to receive a spike/protrusion extending from the post cap (25;100). The device post cap (55;140) comprises a second side (175) opposite the first side (85; 45), the second side (175) being adapted to receive the post.
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