Replacement lock

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Hi,

All of a sudden our exterior door into the garage has stopped shutting properly, and won’t lock. I’ve taken the handles off and can’t see anything obviously wrong, but the inner part with the lock itself is very rusty and you can see the lock is not turning properly. The door hasn’t shut on properly for a few weeks now.

This is probably a basic question but I am a novice - what is the part that I need to replace as per image below? Had a look online and found something similar at toolstation but measurements didn’t match anything I have. Please can you advise.

Thanks
 

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Dig online for a 5 lever 6 inch mortice lock.
You might get lucky and find one that matches yours so a straight swap.
I see no brand on it, so just a matter of researching online (ebay?)
If you don't find an exact match, you will need to chisel out something to accommodate the new lock, but try to stay on the 6 inch.
 
take it out, photograph it, and measure it accurately please. It will not be called a 6-inch lock. It will be described by the width of the case from fore-end to back. Most likely ABOUT two and a half inches but varies by brand. Might be ABOUT three inches. Also measure the thickness and height of the case, and, most imorttantly, the precise distance between the centre of the keyhole and the fore-end. May be 40/42/45mm and is important or the new one will not fit your existing keyhole.

also please photograph the key and the letters and numbers stamped on it.

It is a sashlock and the old one is not British Standard (no rollers) but I recommend the new one should be.
 
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Hi John,

Thanks for the info - I’ve taken it out and measured - see photos. Looks like 2.5 inch width, and 45mm from keyhole. The key itself says Legge on one side and H42 on other.

Do these measurements all point to one particular type of lock?

Thanks
 

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Different makers have slightly different opinions on the precise dimensions of a two and a half inch lock. It will usually be easiest to fit the same make.

The BS3621 sashlock is probably right, but inspect the technical drawing. Notice they have a 44mm and a 45mm backset version.

https://www.ironmongerydirect.co.uk/search?query=legge

Your old lock is a 3-lever and this will be better, it might be a fraction thicker. If necessary you can ease the mortice in the door with coarse sandpaper wrapped round a block of wood, or a sharp, broad chisel.
 
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