Chop saw with top table

A saw comprising: a base (2); a first table (4) rotatably mounted about a vertical axis (8) within the base (4); a bevel mount (16) pivotally mounted about a horizontal axis (18) on the edge of the first table (4); a motor unit (20) pivotally mounted on the bevel mount to allow the motor unit to pivot from a first raised position towards the table to a second lowered position; a saw blade (22) rotatably mounted on and capable of being rotationally driven by the motor unit (20); and a second table (12) mounted via a height adjustment mechanism on the motor unit (20) having a slot (42) formed through it through which the top section of the circular saw blade 22 is capable of projecting; the height adjustment mechanism comprising a support rod (301) attached to the table which is capable of being axially slid in a linear manner on the motor unit, the sliding movement of the support rod (301) being controlled by a guide mechanism; a locking mechanism (316, 336) to releasably lock the position of the support rod (301) on the motor unit (20); wherein the guide mechanism comprises a sliding support (340) mounted on the motor unit (20) which slidingly engages with the side of the support rod (301), characterised in that the sliding support comprises a body (342) attached to the motor unit having two projections (360, 362), the two projections (360, 362) engaging with the side of the support rod (301).