The gearboxes are stamped Maco BS22 ( = 22mmbackset) or alternatively Maco BS20 (= 20mm backset) Maco Inline Upvc Window Lock Rods 20mm & 22mm Back Set GR1 to GR5 Backset: 20mm & 22mm Gearbox Mounted: Inline Faceplate: 16mm Flat Length: 400mm to 1200mm Locking Point Type: Mushroom 7.7mm high Number of Locking Points: GR1, GR2 & GR3 = 2 GR4 & GR5 = 3 The new lock cams have a Allen key hole in them which when you turn it will move the cams in and out approx 1-2mm to adjust the window... Maco Inline Upvc Window Lock Rods 20mm & 22mm Back Set GR1 to GR5 Backset: 20mm & 22mm, Gearbox Mounted: Inline, Faceplate: 16mm Flat Maco Offset Espag Window Lock Mechanism Rod Upvc Window Locking Mechanism 20mm Backset Avocet 600mm Offset Espag Window Lock - Offset Window Types Of The new lock cams have a Allen key hole in them which when you turn it will move the cams in and out approx 1-2mm to adjust the window compression Maco Inline Espag Window Lock Locking Point Type: Mushroom 7., 7mm high Length: 400mm to 1000mm
