Plumb Bob

Bob's Plumb, Plumb's Bob, Blum Pob or "Henry" as I call it. Tool for finding vertical, or hypnotizing your friends and amazing your house guests with your supernatural powers of persuasion.

Requires:
3x M3 10mm long screws
1x long piece of string (I stole mine from the window blinds. Don't tell mum / the wife / granny / the aliens living in the attic)
?x some heavy stuff