Abstract: A cylinder lock insert 10 has a manually operable knob 14 which is used to operate a lock bolt 6 of a rim lock 8 or the like. The knob 14 substantially encloses a lock input means 30 which is preferably a finger or thumb print recognition device. Correct user input causes a controller to engage a solenoid operated clutch 16 which in turn allows torque from the manual turning of knob 14 to be transmitted to the mechanism of the bolt 6. The lock may be rechargeable by means of a solar cell 34 and/or a knob operated dynamo (74 FIG. 4).