"You Need a New Door"

I was recently called to a customer who had already been told by another company that his front door couldn't be repaired.

According to them, the multipoint locking mechanism was obsolete and replacement parts were no longer available. Their recommendation was to replace the entire front door.

Fortunately, before committing to that expense, the customer was referred to me for a second opinion.

After inspecting the door and the locking mechanism, I was able to reassure him that the door was perfectly repairable.

Better still, I already carried the parts needed on my van.

With the customer's approval, I got to work.

Replacing the Faulty Gearbox

The first step was to remove the multipoint locking mechanism from the door.

After stripping it down, I replaced the worn centre gearbox with a compatible replacement and tested the mechanism before reinstalling it.

It was certainly better, but something still didn't feel quite right.

Although the gearbox was operating, there was still a slight stiffness that I wasn't happy with.

Rather than simply fitting it back into the door and hoping it would free up over time, I continued investigating.

Looking Beyond the Obvious

I first lubricated the mechanism using GT85 and tested it again.

It improved slightly, but there was still a roughness that suggested something else wasn't quite right.

I then removed one of the hook assemblies and dismantled it.

Inside, I found a build-up of dirt and grime that was preventing it from moving as freely as it should.

After thoroughly cleaning the components and reassembling the hook, the difference was immediate.

The mechanism now operated smoothly throughout its full travel.

It's a good example of why experience matters. Sometimes the failed part isn't the only issue, and taking a few extra minutes to investigate can make a significant difference to the finished repair.

Rebuilding the Door

Once I was happy with the mechanism, I reassembled the door.

As part of the repair I also fitted:

• A new set of door handles.
• A snap-resistant euro cylinder.
• Five new keys.

Everything was tested with the door open and operated perfectly.

One Final Adjustment

When I closed the door for the final test, I noticed another issue.

The handle needed lifting twice before the door would lock properly.

That immediately told me the problem wasn't with the mechanism—it was the alignment.

The frame keeps weren't positioned correctly, and the hooks were digging heavily into them instead of entering smoothly.

This places unnecessary strain on the gearbox every time the door is locked.

Fine-Tuning the Alignment

I carefully adjusted the frame keeps and fine-tuned the locking points until the clearances were correct.

The aim wasn't simply to make the door lock.

I wanted the locking points to engage smoothly, pulling the door firmly against the weather seals without forcing the mechanism to work harder than necessary.

After several small adjustments, everything lined up perfectly.

The improvement was remarkable.

The handle lifted effortlessly.

The key turned smoothly.

The locking points engaged cleanly.

The whole door felt completely different.

A Door That Worked Better Than Before

Once I'd finished, I asked the customer to try the door.

After opening and locking it a few times, he smiled and said:

"It's never worked like that."

Comments like that are always satisfying because they show the repair hasn't just fixed the fault—it has improved how the door operates overall.

Instead of replacing an entire front door because the mechanism was thought to be obsolete, the existing door was restored with the correct parts, careful adjustment and a proper diagnosis.

Don't Assume an Obsolete Mechanism Means a New Door

Many older multipoint locking mechanisms are no longer manufactured, but that doesn't automatically mean the entire door needs replacing. In many cases, compatible gearboxes, replacement components or adapted parts are still available. Combined with careful cleaning, lubrication and correct door alignment, an experienced locksmith can often restore a door to full working order for a fraction of the cost of a replacement.

Related article: UPVC door problems and diagnosis.