It depends on your knowledge and/or acces to machining time.

But for a beginner, an electric lifter is easy enough.

If you're aquinted to industrial pneumatics, a low pressure lifter or even flipper is doable.

Disks/drums/bar spinners seem mechanical easy to do, but once you get useable powerlevels, it needs a lot more than some cast iron bearing blocks and a semi lined up shaft carrying an old flywheel from a car.

And the least easy to do right, hydraulics.