I came here to share that the importance of using contemporaneous materials, if not methods, was highlighted for me when I worked on Bath cathedral and saw how the victorian 'improvements' of using iron rather than wood to fix the stonework caused much damage a century later; iron expands when it rusts and causes cracking.

Then I see linked in that article that Notre Dame was a very early example of using iron staples! I can only think that they were used away from water, unlike Bath, where the repairs were on the window fixings.