A good write up, thanks for sharing.
I'm not sure how much of your experience can translate to GSO RC10CF, but I can confirm several of your statements, including:
* switching to a different focuser - I did Moonlite as well
* I've had issues with a flattener exactly as you mention. I think it's also occurred with a reducer as well, but I'd have to verify that to be sure.
* I agree with the weight issue, but I've managed to get by, I think it helped that I added a dew shield to the top that added weight. I've also got a small weight on the scope's top bar that I can slide back and forth for finer weight adjustments. It could also be that the larger RC10 has the balance point in a different spot.
* I haven't got a dew heater yet although I've had some problems with dew in the past. The dew shield however seemed to reduce those a lot.
* As far as I can tell, I haven't had any issue with tilt in the system and I haven't done any collimation yet. Now that I'm getting the observatory setup and a permanent install, I can check and investigate this further.
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