Before making a replacement, you need to choose and purchase the lock itself. Buying a lock is best in a good store. Buying such an element of protection in the market or in a suspicious store is not the best choice. If necessary, in a good store, you can get advice from a specialist who will help in choosing the most suitable castle in a particular situation both in functionality and reliability, and in the price category. But it is not always necessary to replace, sometimes you can repair the castles of Shabolovskaya