Old fashioned door knobs

7 Feb 2008
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United Kingdom
I would like to change the door knob on an old door.

I have unscrewed the old knob, and screwed the new knob onto the door (outside), but I can't screw the other knob onto the door (bathroom side) because I can't screw it into the old fashioned mortice type thing, because it is metal.

The old knobs screwed directly into the spindle, the new knobs are designed to be screwed into the door.

Hope this makes sense, thank you in advance.
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I will guess that you mean the door has a mortice lock, or a mortice latch, that obstructs long screws. Knobs that are screwed to the door through the rose are not as strong as those screwed to the spindle, and more likely to pull off.

In which case you need shorter screws, or a bolt-through lock (or latch) case. If you already have pilot holes, nip the points off the screws to shorten them.

Some photos would help.

A mortice lock case usually looks something like this. 5-lever locks used on external doors may be about 18mm thick. Flimsy locks used on bathroom doors may be about 12mm. The faceplate is wider than the body.

And a modern tubular mortice latch something like this.

Observe that these examples are pierced with two holes for bolt-through fixing.
These are bolt-through screws.
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Thanks for your reply, but the lock is more like this but has about 10 layers of paint on it.
Then you need to get a different knob. Try IronmongeryDirect, they have a very wide range.

Yours is not a mortice lock, but a rimlock.
(more precisely, a Horizontal Rim Sashlock).
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yep there are plenty of places that sell just the knobs though

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