TokyoMike

You’re welcome.
Another method, which involves using two shapes but might be better in some cases, is to put one shape inside another.
Doing it this way you have two layers which can be manipulated separately.
See attached video.
2020-06-11_09-04-46.mp4

You can use the Fill Tool to achieve this. See attached video.
Make sure you edit the gradient from the Context Toolbar – rather than directly on the layer – otherwise this ‘trick’ doesn’t work.
2020-06-11_08-48-50.mp4

Correct. Shapes do not behave the same as text for me on the iPad. Shapes perform as expected. For me text does not - I need to do the trick with the line to rotate around a circle  
 

Using the techniques from this lovely community I was able to create a much more complex (for me) graphic. I still have some things to learn - sometimes when I move the focal point it won't snap to the middle of my circle - but I am getting the hang of it. Thanks, everyone!

Cheers - thank you. I had thought I needed to do a select but it seems the duplicate is already selected after the action. I was a little confused as it puts it at the top of the layer list. All sorted out now!

Hi - edited previous post. I have solved it! The cog tool, make the lines dashed, then Layer > Expand Stroke. Then delete segments you don't need. Repeat with 48, 24, 12 spoke cogs made to look like lines.
NOTE: to preserve the dashed lines I found the following steps were required - Make Dashed > Layer > Expand Stroke > Divide. If I just did Divide first the shapes seemed like tiny filled rectangles. 
Practice makes perfect - thank you all for pointing me in the right direction!