The person arranging the job must have authority for the property and hardware change. For a rental or managed property, agree the appropriate permission and access contact. An enquiry does not establish ownership or authorise gaining entry to a locked property.
Hardware must suit the leaf thickness and the maker’s permitted range. Spindles and fixings are not interchangeable solely because the finish matches. Provide the door specification where possible and keep the complete supplied pack together until the fit is reviewed.
The distance from the door edge to the operating centre affects compatibility. Share the product drawing and existing measurement if safely available. An incorrect backset can place the handle or mechanism against old holes, so check before purchasing a replacement.
Replace suitable ordinary mechanical hardware in the compatible existing preparation and check its operation with the authorised customer. Scope limits: Authorised ordinary compatible mechanical lockset replacement only. No lockouts, emergency entry, key cutting, rekeying, locksmith security services, rated-door work or electrical integration.