John Rumm wrote:
stuart noble wrote:

http://i36.tinypic.com/24lmwqr.jpg

A is the sawcut, and B the bit that keeps it on the edge of the
timber. Of course it's upside down and the camera has played havoc
with the perspective (it really is a 90 deg angle!)

Am I the only one that thought:

http://www.internode.co.uk/temp/24lmwqr-mk2.jpg



Probably :-)