Thanks for your reply.

No, the servo just comes on immediately when it is plugged into the driver (which in turn is plugged into the battery pack). It then doesn't change speed at all or respond when the driver is clicked to "off". Bassically, the driver seems to have no effect at all.

I was told that I can't post links on this forum, but I'll give it a shot: juicedlink.com/diy-cookbook/8ft-slider Scroll down to "motorizing the slider" for the instructions, which aren't detailed.

Many thanks for your help!
Rebecca.