The following advice is recommended herewith free of charge and is for consideration only. Please consult a professional as and when appropriate. We do not accept any responsibility nor shall we indemnify against any person for any loss or dissatisfaction being suffered arising from the reliance of our advice.

• Use a cotton cloth with clean water or a non-corrosive cleaner to clean dust.
• Use brass polish to restore the shine.
• If it gets difficult to turn the door key, the best thing is to inject some graphite powder to tumblers, making the mechanism operate more smoothly.
• A simple and fast solution is to use oil to lubricate the tumblers.
• Strips of sponge tape at the four corners of the doorframe will reduce slamming noise.