Keep the strike, fixings, instructions and all compatible fittings with the new lockset. Missing components can prevent installation even when the main body is present. Do not assume unrelated spare screws or old fittings will meet the new product’s requirements.
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.
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.
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.