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Ok I have a mount thus:
The pipe is plastic filled with concrete/steel and there are only three bolts on the ratbox.
I can grab hold of the focuser knob and twiddle it with the bahtinov showing on APT on the screen at x10 liveview and the image moves less than 1/20 of the screen width About 3.6 seconds of arc. There is no vibration when I let it go.
So I guess the three bolts do not interfere with my rigidity or strength much.
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