Homemade indexing tool for lathe chuck, easy and cheap

This is a cheap and easy to make, simple device for indexing a lathe chuck.
All credit to Winkys Workshop for the idea of using a 48 tooth gear. See his excellent video at this link.
   • Simple Indexing on a Metal Lathe  
There is no easy or cheap way around my part of the world to find a 48 tooth gear like Winky used.
I decided that using a 48 tooth motorcycle sprocket was a better solution. It is a larger diameter and therefore greater precision. The sprockets are used on pit bikes so are available cheap from Aliexpress or Ebay.
A 48 tooth sprocket gives you the ability to divide one revolution into 2x, 3x, 4x, 6x, 8x, 12x, 16x, 24x and 48x so this does most common indexing tasks that I will want to do. You can see in the video that I have fixed the sprocket on with 2 studs and nuts. This was so I can fit sprockets with different numbers of teeth to get different indexing.
The sleeve I made slides over the back end of the lathe spindle and is locked in place with 2 set screws. Winky made his with an expanding collet inside the spindle so have a look at his video if you prefer that method.
Remember to unplug your lathe before fitting the indexing device as it would be a really bad day if someone turned on the lathe with the indexing wheel locked in place on the spindle.