Jon, Thanks from me, too, for the feedback. I'm glad I could help. Were you able to change something that's now making it work okay for you? Regarding a script, it is probably not a hard thing for me to write, to "beat" on the focuser and send the focuser back and forth between two positions in a continuous loop. If you feel like this is something you still need, I'll try to gin something up. It could be run in the daytime, since you're only talking about using the focuser. By the way, I have a TCF-S focuser also. Mine is about 18 years old now, and still working like a champ.