Garage door DIY: what's fine, what's false economy, what's dangerous

Garage doors attract confident DIY, partly because half the jobs really are simple, and partly because the door hides how much stored energy it's carrying. So here's the honest sort: the jobs that are yours, the ones that waste your Saturday, and the one category that ends in the emergency department often enough that we won't soften the language.

Yours, with our blessing

• Cleaning tracks. A dry cloth, maybe a little methylated spirits. No grease on tracks, ever: grease collects grit and grinds it into the rollers.
• Lubricating hinges, rollers and the spring's surface. A garage-door lubricant or light silicone spray, sparingly, once or twice a year. Skip the engine oil; it gums.
• The balance test. Door closed, opener released, lift halfway, let go gently. Stays put: healthy. Slams or races: stop there and book it. The test is safe; the repair it reveals isn't.
• Battery swaps and remote reprogramming, with the manual open. Ten patient minutes.
• Simple bottom seals on a light roller door you can lift comfortably. Covered properly in the seals guide.

False economy: legal, safe-ish, and usually regretted

• Forcing a binding door and calling it fixed. The bind is the symptom. Muscling through it transfers the load to the opener, and opener gearboxes cost more than the adjustment would have.
• Adjusting opener force limits to "solve" a door that reverses. The door reverses because something resists it. Turning the force up teaches a forty-plus-kilo machine to push through obstacles, which is precisely what its safety settings exist to prevent.
• Straightening bent track with a hammer. Track geometry is the door's rails; near enough isn't. It runs rough forever and chews rollers.
• Fitting an opener to an unbalanced door. The motor becomes the counterweight and dies young. Balance first, automation second, always.

Not yours. Genuinely dangerous.

Springs, and everything attached to them: cables, drums, bottom brackets. A torsion spring holds the door's full lifting force as wound-up steel, whether the door is moving or not. Released without the right bars and technique, it lets that force go in a fraction of a second, and the injuries it causes are hand, face and head injuries, not bruises. The same warning covers lift cables and the bottom brackets they anchor to, which are under the same tension. There is no YouTube video standing between you and physics on this one. If the door went bang, or a cable's off, or a spring looks stretched or gapped: hands off, book the call-out, and feel no shame; we carry purpose-made bars and we still treat every spring like it's loaded, because it is.

One more line for the extension-spring owners, common on older tilt doors: if your springs stretch along the tracks and have no cable running through their middle, that missing safety cable is the cheapest piece of insurance on the door. Ask for it by name at the next service.

Where the line actually is

If the job involves the door's weight or the parts that carry it, it's ours. If it involves keeping a healthy door clean, lubricated and understood, it's yours, and doing it makes every visit we ever pay you cheaper. That's the whole philosophy of the service visit: we do the tensioned work, you get a door that mostly doesn't need us.