The mailed kit, worked over weeks

The first tutorial component in the curriculum, because GEN-E is the first unit with hand skill in it.

A tutorial is a guided first encounter, and it is a different document from a procedure. The how-to tells you what to do once you can do it; this tells you what your first attempts will look like, why they will be wrong, and what to change.

Why this is worked at home, in the kit

The argument was first made for an earlier design, the residential block specification (superseded 2026-09-18), and it still holds, because it explains what is being asked of you.

Massed practice produces performance that decays. Distributed practice produces retention. A student who is excellent on the last day of a short course and mediocre three months later has passed and learned nothing durable.

So the kit builds hand skill, a little at a time. Safety wire and cable swaging are posted to you in the General bench kit and worked over weeks, and what you send back is inspected. The artifacts are durable and they display their own quality: a wire run shows its twist rate and its direction permanently, and a swaged fitting either passes the gauge or does not.

Twenty minutes a day for three weeks beats a day of it. That is not a study tip; it is the reason the kit exists.

Session 1 — Safety wire: the direction, before the technique

Materials: practice bolts in a plate, wire, safety wire pliers.

Do not try to make it neat yet.

1. Take one bolt. Turn it a quarter turn loose and watch which way the head moves. Say the direction out loud.
2. Run a single wire from that bolt to an anchor point so that if the bolt turns that way, the wire is pulled tight. Do not twist it. Just run it.
3. Test it. Push the bolt in the loosening direction. Does the wire go taut?
4. Now run it the other way deliberately and test again. Feel the difference — the wire goes slack and the bolt is free.

What you are learning: the direction is the whole thing, and it is decided before you pick up the pliers. Most first-attempt failures are correct technique applied to a backwards run.

Expect: to get the direction wrong at least once on a three-bolt group, because the second and third bolts change the geometry.

Session 2 — Safety wire: the twist

1. Wire a pair of bolts using the double-twist method.
2. Aim for an even twist rate along the whole run — this is the visible mark of a competent installation and it comes from consistent pliers technique, not from pulling harder.
3. Finish with a pigtail and bend it under.

What will be wrong on your first attempts:

The last row is the only failure that matters. The other four are cosmetic and improve with repetition. That one is a live installation that holds nothing.

Session 3 — Safety wire: three fasteners, then repetition

Wire a group of three, then do it again on a different day. And again.

Do not do all the repetitions in one sitting. The skill you are building is the one that is still there in a month, and that skill is built by returning to it.

When you are ready to send it in: the run holds in the loosening direction on every fastener, the twist rate is even, the pigtails are tucked, and you can do it twice in a row without thinking about the direction.

Session 4 — Cable swaging: the inspection hole

Materials: cable, swage fittings, swaging tool, go/no-go gauge.

1. Before anything else, look through the inspection hole in an unswaged fitting. Push a piece of cable in until you can see it. Note how far in it has to go.
2. Cut a piece of cable square, by the specified method. A ragged cut with strands unlaid will not insert properly and is the commonest first failure.
3. Insert fully. Confirm the end is visible in the inspection hole.
4. Swage in the specified passes.
5. Gauge it. Go/no-go, at each swaged position.

What will be wrong on your first attempts:

The gauge is not an opinion. A swage the no-go side accepts will pull out under load, and it will look exactly like one that will not.

Session 5 — Torque wrench feel

You need a torque wrench for this, and it is worth borrowing one if you do not own one.

1. Set a value and tighten a practice bolt. Listen for the click and stop.
2. Click it again at the same setting. The bolt must not move. If it does, your first application did not reach value — usually because the motion was jerky rather than smooth.
3. Try it deliberately badly: tighten fast, and stop by feel rather than by the click. Then check with the wrench. Note how far off you were.
4. Release the wrench to its lowest setting when you finish. Every time. A wrench stored loaded drifts out of calibration.

What you are learning: a torque wrench measures what you do smoothly, not what you do quickly, and the second click is the only confirmation available that the first one worked.

Session 6 — Micrometer: reading, and then reading again

Materials: a micrometer and something of known size.

1. Close it on zero with the ratchet. Read it. Repeat five times. Do your five readings agree?
2. Now close it using the barrel instead of the ratchet. Repeat five times. Now do they agree?
3. Measure a known standard three times, at three positions.

What you are learning: step 2 is the point of the session. The spread you get from barrel feel is larger than the tolerances you will be asked to judge, which is why the ratchet is not optional.

Expect your barrel readings to vary by more than a thousandth, and your ratchet readings to agree. If they both agree, you are not using enough force on the barrel to see the effect — which is itself worth knowing.

What to send back

Send the failures as well as the successes, with a note on what you think went wrong. A candidate who can diagnose their own bad swage has learned more than one who sent two good ones and cannot say why.

License

CC BY-SA 4.0 (Licensing).