Still working!!!
Sorry about the delay. I have the flu and can only work between coughing fits. I had to take one night off.
Anyway, I returned to the factory today, and removed the tail post blocking and clamps. I'll fill the minor gaps with a little epoxy and microballoon, most of which will be sanded away when we bevel the fin post.
Here is our unclamped fin post. The fin edge is perfectly straight and flat now.