First stage completed sucessfully with only a short crack at the end that will not effect the length needed for a knife handle. There was some springback from the 9mm thick they were clamped (down from about 16mm) to but as this is old and very dry horn I am going to boil it next in black dyed water and re-clamp to fix the thickness needed. It was sugested that I use oil to boil/heat in but my concern is that there may be oil penetration into the horn and conflict with the epoxy