A friend of a friend has asked for some advice regarding the above. I don't have any details of the car except that it's a very old Alvis, I have seen the mechanism which has 5 entrained cog wheels, 2 springs all mounted on steel plate which I assume is bolted within the door. Generally it looks in reasonable condition, however one of the cog wheels is partially stripped and needs replacing or rebuilding.
Does anyone know of a firm or a hobby machinist who can do this kind of repair.
Regards Don