On the choke, idea, Phyllis' handbook (part nos. AKD 680H, plus supplement AKD 3922/1) states:
If you don't turn it, you will feel the 'clicks' or notches as it reingages with the body housingMixture control
The mixture control can be drawn out and turned 90' anti-clockwise to lock in position to give a rich mixture for starting purposes.
Even so, keep up the good work chaps!