Excellent article! so much better to have all the steps as photos than just do a video, as far easier to follow. As for grease, sturmey archer IHG grease seems to work well, if you have some lying around!
Hey Andrew, think height of the child and size of bike/adult rider. My little one is 3.5ys, but is 105cm tall - so very quite tall for her age (she as the same height as an average 4.5year old). Mac-Ride say ideal for 2-3year old, but works for 4-5years. Think the increasing frame reach is helping as you can get them further forward.
You should def give one a go to compare to the Shotgun (also Shotgun do some nice mini handle bars to attached if you don't want to put little grips or bar tape)