I have exactly the same from Optec (Focus Linx). I think they make them for Feather Touch. Mine is on a feather touch focuser as well. They are a bugger to get them running smoothly as they tend to grab and grind until you find the sweet spot. After that they are fantastic. Mine is now running very well with the auto-focus routine in Sequence Generator Pro. Hope you get a clear night soon.
cheers,
Bruce.