Adjustable Speed

Adjustable speed actuator?
I plan on using this 20″ actuator for a small project. It is rated at moving 1/2″ per second with no load. At that rate, it’s full travel will be done in 40 seconds.
http://www.firgelliauto.com/product_info.php?cPath=93&products_id=109
I need to make it slower. Say 1/4″ or even 1/8″ per second or slower. Is this possible? With some kind of voltage control?
Thanks,
Jeff
I would also like to make this adjustable on the fly. Maybe a rotary switch with several settings for speed.
running it at 12volts is the easiest way to get half the speed.
3 – Variable Speed with POT
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