Removing the centre board case
Will came round to help me with this job as it is way quicker and easier with two people (and then it still takes a lot of effort!!
The way you should start every days boat building!
careful
use of a grinder made some jobs a lot easier - try not to set fire to
the boat though!
To ensure we
keep the boats shape we braced the thwart before cutting through it. This
allowed the case to be removed without the boat going floppy
We gently went around the case several time easing chisels between the hog and
case (all the screw heads had been drilled out)
Using a pallet knife we eased (or whacked with a hammer) a gap between the case
ply and the hog
Once we felt some give we worked from the back to the front with wedges of every
kind!
Eventually she came out.... 
... but we had cracked the hog quite badly at the front.
After a lunchtime beer and a sandwich we decided it was better to remove that
part of the hog completely - out with the grinder again.
once out it looked quite neat and ready for a relatively easy repair.