How to generate the update_spinner.mng

You will need ImageMagick in your path (the 'convert' executable at least)

Go here: http://preloaders.net/en/circular

Select the base image you want to use.

Image type: APNG
Transparent background: Yes
Foreground color: F2A555 (or select a color)
Animation speed: (default value)
Preloader size: 16 x 16

(no Advanced Options changed)

Additional download options:

Check Download as sprites

Press Download now

Rename the file to base.png

convert -dispose 3 -delay 10 base.png -crop 16x16 +repage update_spinner.mng

If you want to use the make_spinner.py (gives worse results):

In http://preloaders.net/en/circular change

Preloader size: 128 x 128

Press Download now

Rename the file to base.png

convert base.png -crop 128x128+0+0 reload_scaled.png

and use the make_spinner.py . Note that the results aren't very good.