It is so refreshing to hear one of the very few fellow hobby-horse riders stating the obvious - if it can't be protected then record it. Even if it can be protected - record it. Photograph it, video it and if possible measure and draw it.
Another one for the list of neglected structures is the Hathorn Davey pumping engine near the site of Marine Colliery south of Ebbw Vale. Although preserved, I spent a morning measuring and drawing it some years ago with the result I found that at least one linkage has been reassembled incorrectly. I was once told that you don't know a structure (building or engine) until you measure it up, and how true that is!
And another - the water balance winder at Cwmburgwm(?) north of Pontypool; dismantled and never rebuilt years ago 'in the interests of preservation.' Wonder if the scrapman got it?
Yes, I'll have it - what is it?