ALOA CAL common mistakes
ALOA CAL · Understand the traps and how to avoid them.
Treating every pin-tumbler cylinder as if it has the same number of pin chambers and the same pin stack conventions, then keying or repinning without verifying the specific cylinder's chamber count and depth increments.
Candidates learn one cylinder type during study and generalize it to all hardware, so they apply a familiar pin stack to a cylinder whose chambers, spacing, or increments differ.
What to do instead
Before any pinning or keying task, identify the exact cylinder model and confirm chamber count, keyway, and depth increment from the manufacturer's specification; write the pin stack out explicitly before loading pins.
Reading a key's bitting by eye and transcribing it into a code sequence without measuring the cuts against a known depth key or caliper.
Visual estimation feels fast and candidates trust it under time pressure, but cut depths differ by only a few thousandths and small errors shift every subsequent pin choice.
What to do instead
Decode by measuring each cut with a depth gauge or caliper against the system's depth key, record each cut, then verify the finished key in the cylinder before committing the code.
Building a master key system by picking pins ad hoc for each lock instead of constructing a progressive or rotating master key schedule first.
Candidates reason lock-by-lock because it mirrors how they physically pin a single cylinder, and the shortcut works for two or three locks before collapsing at scale.
What to do instead
Design the system on paper first using a documented progression or rotating constant method, verify no two change keys share a bitting, then pin each cylinder to the written schedule.
Assuming a master keyed cylinder is correct because the master key operates it, without testing that the change key operates only its own cylinder and not others.
The master key is the one that gets tried first and it will turn even when the pin stack is wrong, so the error hides until a change key is used.
What to do instead
Test in both directions: master key in every cylinder, and each change key in its own cylinder plus at least one neighbor it must not open. Record the results.
Bypassing or disabling a lockout/tagout step, or working a lock while it is still mounted and under load, because the job 'will only take a minute.'
Routine servicing breeds complacency, and candidates under exam pressure skip the energy-isolation habit they would otherwise follow on a real door.
What to do instead
State and follow the isolation sequence every time: verify the door is secured or the circuit de-energized, tag it, then service. Treat mounted hardware as energized until proven otherwise.
Diagnosing an electronic lock failure by replacing the lock body or reader before verifying power, battery condition, and wiring continuity.
The visible hardware is the obvious suspect, and candidates jump to the component they can see rather than tracing the circuit that feeds it.
What to do instead
Follow a fixed diagnostic order: power source and batteries, then wiring and connectors, then controller logic, then the lock mechanism itself. Document each check before moving on.
Giving a customer keying or access-control advice that serves the immediate request without disclosing the security tradeoffs, such as a master key that opens every unit in a building.
Candidates want to be helpful and answer the literal question, and they omit the consequence because no one asked about it.
What to do instead
Before delivering keys, explain in plain terms who will hold which keys and what each key opens, and note the risk of a single lost master. Put the disclosure in the work order.
Mixing pin types, lengths, or worn and new pins within a single cylinder to make a stack 'close enough.'
A short pin or a worn driver can appear to work in a bench test, and candidates substitute available stock rather than restocking the correct size.
What to do instead
Use only pins of the correct type and measured length for that system, replace worn pins as a set, and confirm with a key gauge and function test before closing the cylinder.
Impressioning or picking a cylinder in use without first confirming authorization and ownership, or without a documented record of the work.
The technical skill is the focus of study, and candidates treat the authorization step as paperwork rather than part of the procedure.
What to do instead
Confirm in writing that the requester controls the lock, record the date, location, and purpose of the entry, and retain the record with the job file before any bypass tool is used.
Assuming a key blank is correct because it enters the keyway, without checking blade thickness, milling, and shoulder reference against the cylinder.
Entry into the keyway is a strong visual cue, and candidates stop checking once the blank slides in, missing that the shoulder or milling will misalign every cut.
What to do instead
Verify the blank against the manufacturer's blank reference for that keyway, check shoulder-to-first-cut spacing, and cut a test key on scrap stock before duplicating a customer key.