In article om, Dave
Liquorice writes
On Wed, 18 May 2005 21:54:20 +0100, Janet Tweedy wrote:

Why doesn't anyone invent a spirit level that's really a flat square
with the bubble bit in the centre and four radial glassy bits so you
can see each way at once if you balance the flat square on top of
things

You can get such bubble type levels but it would rely on the top of
the post being smooth, flat and cut square...

What you want is a post level like:

http://www.screwfix.com/app/sfd/cat/...92960&id=14623

Think I've seen them in the sheds.

Tack a piece of string with a weight to each face of the post. If the
post leans in one direction, the string will hang away from that face.
--
Kay
"Do not insult the crocodile until you have crossed the river"