flipping an icon

I am trying to flip the thumb on a horizontal slider so that it points
down instead of up.
To do this I need to flip the icon representing the thumb
(I am using MetalSliderUI which uses an Icon for the thumb).
I tried rotating the icon 180 degrees but it proved to be very slow.

Any suggestions as to how to just flip an Icon horizontally.

Thanks

Ralph Boland
.

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