Just got one for my 9.25 Evo. The manual is a bit "sparse" (to say the least).
Installation was a bit difficult. I removed my old faifthful Feathertouch, put a large piece of paper on the OTA to NOT forget to put the screw and washer back on the threaded shaft, and started having issues:
1- that orange plate was perhaps designed with an intent to harm (or at least to annoy). It pushes back the ball bearing that is threaded (along with the brass knob) on the focuser shaft (which is good) but if the alignment isn't perfect, it also prevents it from rotating freely.
2- even if the alignment is OK, don't over-tighten the three screws that hold the orange plate in place.
3- same with the two captive screws that hold the motor case onto the plate. If you do like I did first, you'll end up with a totally stuck motor focuser. I could rotate it by hand using the provided wrench, but the motor wasn't powerful enough. I had to disassemble the whole apparatus, and find a good position by trial and error.
Still, on my C9 (and, I suspect, on a lot of other OTAs as well) there's a substantial lateral play on the threaded shaft which makes it really hard to center things properly. I can hear my motor struggling when it rotates (however I could do a successful calibration). If anyone has a good solution to prevent a possible straining...
Last, shouldn't the back end of the motor tube have some kind of plug? The threaded shaft can be clearly seen there, and I'm a bit concerned about dust entering the OTA after some time.
EDIT: for those interested, I also forgot to mention that on a C9 it's incompatible with the current Hyperstar (v4) counterweight (the one that is screwed in lieu of the visual back), by a few mm. I guess I'll try and find someone that could machine a slightly modified counterweight: would someone know the correct thread pitch?
Edited by Clouzot, 20 May 2019 - 10:25 AM.