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A Comprehensive Guide to Cylinder Lock Replacement Replacing a cylinder lock can appear like an overwhelming job, however with the best info and understanding, it can be a manageable DIY project. Whether you are dealing with a stopped working lock, updating security, or needing a key modification, cylinder lock replacement is a vital skill. This post describes what you need to understand before starting this job, providing clear, step-by-step guidelines, common risks to avoid, and a list of FAQs to resolve any lingering doubt