A video tutorial on how to replace a Maco 53431 old style door gearbox. This Maco gearbox is sometimes also known as the 56231 / 5ST / 5 STKPurchase a new Maco 53431 Upvc Door Gearbox from Upvc Spares 4 Repairs here: https://upvcspares4repairs.co.uk/maco...