Coppen stones are copping stones I think.
Clubscrew no idea.
Building wise there are more lead alternatives, as lead requires a specialist with lots of PPE so usually expensive.
Club screw is the lumpy bit that marks the divide between the two properties I think
I can't remember the roofing terms, trying to remember if I knew them. Tho I forgot the names of bits of a window and what risotto was while eating risotto.
Even googling came up with nothing apart from golf clubs.
@gillies started
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Coppen stones are copping stones I think.
Clubscrew no idea.
Building wise there are more lead alternatives, as lead requires a specialist with lots of PPE so usually expensive.