a lot people use Knobman:
https://www.g200kg.com/en/webknobman/
you can try searching the gallery for a suitable knob as an alternative.
https://www.g200kg.com/en/webknobman/gallery.php
I suggest you keep your current knob background and just make a knob stack of the pointer line.
It will be more efficient and help reduce the file size of the knob.
This way also allows you to easily redesign the knob background if desired.
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