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Photo four shows the cylinder plug being faraway from the cylinder. The high of the cylinder accommodates pins and springs, which maintain strain on the keyed pins.
If http://casathome.ihep.ac.cn/team_display.php?teamid=826185 -latch, often described as a ‘Yale Lock’ is just being modified for safety reasons, then solely the cylinder will have to be changed which will hold the value down. If the entire night time-latch must be modified (if you're upgrading the safety) then this will price somewhat extra. If your door is uPVC and just the cylinder needs replacing then will probably be cheaper than changing the entire mechanism as this only needs to be accomplished if there's a problem. An common Euro cylinder will price round £45 and may differ depending on make/mannequin