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Retrofit instructions for shutter motorisation is clear and straight forward. I found the only complexity was working around your telescope while in the dome. Best thing to do is move all your gear out so you've got easy access the inside dome roof via a step ladder. The shutter actuators and other fittings are easy to install. I retrofitted the shutters in a leisurely five hours without assistance.
Leading up to the installation I found some install notes online to help prepare. Little did I know that the notes were for the earlier retrofit kits and they required far more involvement it cutting, glueing and wiring. The more recent retrofit kit which I installed have been more well thought out at the factory and much easier to install. The team at Sirius were most helpful in any questions I had regarding the installation.
If you're not operating a remote observatory and can manually open/close the shutter when required, save your money and just go with the rotation kit. I'd recommend all Sirius owners do this as a minimum as it saves you considerable time and energy rotating the dome manually. Having to rotate the dome during all night imaging runs is simply not practical.
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