I forgot to include a couple of things I believe to be important-
1. That hopefully all PPL H's will 'get into the habit'and always take off with the AH set as a result of this training. An important safeguard if caught out by unexpected conditions of poor viz. The pilot will then have something worth looking at....
2. That AH's suffer uneven wear on only one gimbal bearing if left 'stalled'or 'toppled' to one side during flight. They should last longer if always set beforehand and be more accurate during their life.