Many thanks. Yale could not give me any pointers as to whether it was the lock or gearbox but were happy to offer me a 10% discount on a new lock!
Based on crank39, which sounds very logical, I will go the gearbox route first. Looking at the link you kindly provided the outer fixing holes match dimensions on the door. The multilock strip is also marked Millenco but cannot do any other measurements before stripping. It would obviously be nice to have the replacement so I only have to strip once. Will not hold you to it but I'm guessing there is a fair degree of certainty that, from the video, you think this is the correct model given that you sent a link?
Many thanks again.
Based on crank39, which sounds very logical, I will go the gearbox route first. Looking at the link you kindly provided the outer fixing holes match dimensions on the door. The multilock strip is also marked Millenco but cannot do any other measurements before stripping. It would obviously be nice to have the replacement so I only have to strip once. Will not hold you to it but I'm guessing there is a fair degree of certainty that, from the video, you think this is the correct model given that you sent a link?
Many thanks again.