Our London locksmith was called out to commercial property in London, SW1 to change lock on an office door for new tenants on behalf of the managing agents. The lock in question was a Chubb 3R35 detainer lock, these are quite expensive to replace so our locksmith replaced levers within the lock instead and cut 20 new keys on his van which he delivered to the managing agents office in another part of town.
Changing levers in locks or simply replacing cylinders is much more cost effective and is often all that is needed when you are changing a lock.
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