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Dutch, it isn't the weight so much. It's the length.
Even though a 10" reflector on a HEQ5 is too much weight, you could get away with the same amount of weight in an SCT.
The length will give you flexure problems.
That doesn't mean that the tube flexes. But imagine your arm as a mount, now grab the end of a broom and hold it out at arms length. Now try to move the broom. Hard isn't it.
Now hold something short like a wooden spoon. Now try move the spoon.
Now think back to the broom and imagine what your mounts gears must be going through every time you slew the scope, or even a slight breeze pushes against your scope.
Not good.
I wouldn't recommend mounting a 10" dob OTA on a HEQ5 mount.
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