Supervised Service Work — Mechanical and Keying Tasks

Supervised Service Work — Mechanical and Keying Tasks

Your externship puts everything you have learned in the classroom and shop into real service calls for real customers. During this phase you will perform residential and commercial lock installation, re-keying, master-key pinning, and basic safe service under the direct watch of a journeyman locksmith. The journeyman can step in at any moment to correct your technique, so treat every call as both a learning opportunity and a professional obligation.

Arriving Ready: Professionalism and Safety on the Job Site

Before you leave the vehicle, confirm you have all required tools and that your service vehicle is parked safely and legally. Dress and behave professionally — customers are forming an opinion of the business from the moment they see you. Review your work order so you understand the job type before you knock on the door.

Personal protective equipment (PPE) applies in the field just as in the shop. Wear safety glasses whenever you are drilling, grinding, or driving screws overhead. Cut-resistant gloves protect hands when handling broken-key fragments or sharpened blank ends. On commercial sites, be alert to slip, trip, and pinch-point hazards near door hardware and door closers. If a customer's site requires additional site-specific PPE — for example, a warehouse with a hard-hat zone — comply immediately. Never bypass a lockout/tagout procedure if a door or access panel is already tagged out for electrical or mechanical service; report the condition to your supervisor before proceeding.

Lock Installation: Residential and Commercial

For a cylindrical (knob or lever) lock, the general sequence is: confirm the door prep matches the hardware (backset, cross-bore diameter, door thickness), install the latch first, seat the exterior assembly, engage the interior assembly, and test operation in both the locked and unlocked positions before collecting payment. For a deadbolt, verify the strike box mortise depth is adequate and that the bolt extends fully with the door closed. Use a hinge bolt gauge or depth gauge to confirm bolt projection meets the manufacturer's specification.

For a commercial mortise lock, door prep is more demanding. Confirm the mortise pocket dimensions match the lock case, verify all function holes align, and bench-test the cylinder before it goes into the door. Torque screws to snug — not so tight that you crack a trim plate or strip a thread.

Always test the lock from both sides with the door open, then closed, and have the customer confirm the key turns smoothly before you leave.

Re-Keying Cylinders

Re-keying changes the bitting so a new key works and the old one does not. The standard steps are: remove the cylinder from the hardware, insert the current working key, use a plug follower to push the plug out of the shell while retaining the top pins and springs, remove the key pins from the plug using a pinning tray, consult the manufacturer's depth-and-space chart to select the correct new key pins for the new key's bitting, load the new key pins into the plug, reinsert the plug using the follower, test with the new key, and reinstall in the hardware.

Work over your pinning tray at all times. A dropped top pin that rolls under a vehicle seat can stall the entire job. Keep key pins organized by position; mixing them defeats the purpose of re-keying.

Master-Key Pinning

Master keying adds a second shear line to each chamber so that both a change key and a master key operate the cylinder. For a two-level system, each chamber may contain a bottom pin, a master wafer (also called a master pin), a top pin, and a spring. The combined height of the bottom pin and master wafer must equal one of the bitting values; the combined height of the master wafer and top pin must equal the other. Use the manufacturer's depth-and-space data and the master-key worksheet to determine the correct pin combinations. Verify operation with both keys before closing the cylinder.

Master-key pinning is precision work. Even a single pin stack that is one increment off creates a cylinder that binds or picks too easily. Double-check every chamber.

Basic Safe Dial Service

Basic safe service at the technician level typically covers dial removal, cleaning of the dial ring and spindle area, testing the dial for smooth rotation and accurate index, and confirming the combination opens the lock before reassembly. Never attempt to change or manipulate a safe combination unless your supervisor explicitly authorizes and observes the procedure. Safes can have relocker devices that trigger if internal components are disturbed incorrectly; always ask the supervising locksmith before opening an unfamiliar safe model.

Logging Each Call

Complete your daily log within 30 minutes of finishing each job while details are fresh. Record: job type, lock brand and grade (Grade 1, 2, or 3 per ANSI/BHMA classifications), tools used, any problem encountered (broken key, worn wafer, misaligned strike), the solution you applied, and the ALOA CRL exam domain the task addresses. Accurate logs protect you, the employer, and the customer, and they form the evidence base for your credential application.

Weekly Debrief with Your Supervisor

At the end of each week, sit down with your supervisor for a structured 15-minute review. Pick two log entries together, discuss what went well (your strength), and identify one specific area to improve. Set a measurable target for the following week — for example, "reduce cylinder re-key time to under 10 minutes with zero dropped pins." This feedback loop is how journeyman-level skill is built.

Passing This Lesson

Your supervisor rates each observed task on a 1–4 employer evaluation rubric. You must average 3 out of 4 or better across all mechanical and keying tasks logged during this phase. Consistency matters more than a single perfect performance — show that you can meet employer quality standards call after call.