The Paddock lockmaster centre lockcase available in 35mm and 45mm back sets. This replicated centre lockcase can be used to replace the existing lockcase in the event of damage. This is an excellent choice when fixing a damaged lock, as it is much cheaper than replacing the whole mechanism. 35mm (107953) Or 45mm (107955) Backset. 92mm PZ Centre. Available in 35mm backset (124921), or 45mm backset (124922).