The improved bench hook in the previous post did not show the actual device so a photo is included here. Note, at the bottom left corner of the bench hook is the lock, shown in the rotated position. By rotating the lock counter clock-wise it is possible to use the bench hook, flat in a normal position.
Also note that the stop at the bottom has been replaced with two smaller stops that can be rotated to accomodate ovals.
The angle formed by the top of the bench hook and the work bench is about 28 degrees, which seems about right. When applying a lot of pressure during carving, a c-clamp is used on the hold down as shown at the bottom right of the photo.