Cylinder assembly for a door lock

A cylinder assembly for a door lock comprising:

• a housing having a through hole defined through the housing;
• multiple upper lock pins moveably mounted on the housing and extending into the through hole;
• a cylinder securely held on the housing with a fastener and rotatably received in the through hole in the housing, the cylinder having
• a keyhole defined in a first end of the cylinder;
• a recess defined in a second end of the cylinder;
• a curved channel defined in a face defining the recess;
• and
• at least one hole defined in a periphery of the second end of the cylinder;
• multiple lower lock pins moveably mounted on the cylinder and extending into the key hole in the cylinder, each respective lower lock pin having a length different from lengths of the other lower lock pins and abutting one of the upper lock pins on the housing;
• an actuating tongue attached to the second end of the cylinder and having a first end extending into the recess in the cylinder and a second end adapted to be connected to a latch of the door lock, the actuating tongue further having a connecting portion formed on the first end of the tongue to be rotatably received in the recess in the cylinder and a protrusion protruding from the first end of the actuating tongue and extending into the curved channel in the cylinder;
• and
• a cap mounted around the actuating tongue and secured to the second end of the cylinder, the cap having a through hole for the actuating tongue extending through the through hole in the cap and a knob formed on the cap and extending into each respective at least one hole in the second end of the cylinder so as to securely attach the cap to the second end of the cylinder;
• wherein the cylinder has a groove defined around the second end of the cylinder for the fastener being received in the groove so as to securely hold the cylinder on the housing with the fastener.