Thanks will talk it over with herThe thumbturn means it can be opened from the inside without a key
Useful in an emergency such as a fire
But if there is an opening that a hand or simple tool can access, such as a letterbox or breakable glass, so can a burglar outside.
Thanks it was the central cam that was throwing me, Screwfix looks like it’s 50-50 but Toolstation looks like 45-10-45You measure to the centre of the screw so it looks like a 50-50 as listed at Screwfix as "50-50 (100mm)"
But if the end of the old cylinder poked out of the door, try to get a shorter one that will be flush with the escutcheon on the outside
(You sometimes see the 10mm central cam measured separately, then it would be a 45 -10-45)
If you are buying new cylinders, then best to get them suited or keyed alike, so that the same key operates each cylinder.
Ultion cylinders come to mind. Either direct, or a local lock smith that is an agent for them. Then once a key is registered you only need that number to have keys or cylinders made in the future, and no one can cut a key without your permission.Can I ask where do I look for the matching keys
My local locksmith will happily cut such keys with proof of ID and utility bills and completion of a form. I'm now registered with them to make it easier each time.Ultion cylinders come to mind. Either direct, or a local lock smith that is an agent for them. Then once a key is registered you only need that number to have keys or cylinders made in the future, and no one can cut a key without your permission.
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