Wanted

I have spent the weekend trying to find some 20mm clout nails for reroofing our shed. It appears that it is very popular item of hardware as I couldn't find them anywhere. Two major DIY stores didn't have any (one of them didn't have any nails of any type or size). Is there something going on that we should know about??

Anyway, I hadn't known that they were called this and assumed that this was just an instruction manual.