A mortise lock with a deadbolt 27 and a gate 50 and pawl 41 arrangement operated by a cam lever 47 of a cylinder lock 48. The pawl is a sliding member engaged by cam lever and is selectively engaged by the gate via intermeshing teeth. At least one tooth has orthogonal bottom and side surfaces engaging with complementary shaped groove, preferably rectangular, e.g. square teeth and grooves. The gate is preferably spring biased and prevents sliding of the pawl. The gate may include a second tooth of triangular shape locating in grooves with inclined surfaces (52, 58, fig.7). the pawl may include tapered surfaces (65, 66, fig.7) to hinder manipulation by a tool. The pawl may be guided by protrusion (45, fig.7) in a slot in the casing, such guide slots in the case can be covered by forming them as a partial blind groove/slot.
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