Vitawin Window Lock Gearbox Replacement Vitawin window lock gearbox mechanism this gearbox connects to shootbolts. This offer and cheaper and simple method instead of replacing the whole mechanism. You should be able to locate the backset measurement written on the side of the gearbox, if not you will need to measure it in order to make sure you are ordering the correct size you need. Backset: 20mm or 22mm Coverplate 160mm x 16mm Screw Centres 43mm Shootbolts not supplied
