We had this door installed 6 months ago to replace an old one (click for larger image).
It's developed quite a nasty squeak, as far as I can tell on the middle hinge only.
I can see there's a little access cap on top so my first thought was simply to add a drop of light oil but this hasn't helped.
Is lubricating this sort of hinge advisable and if so what do I use and how do I access it?