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Mine is 230mm x 1.7 and it doesn't have any LF vibes -
It is Mains HP water pipe full of concrete and steel.
I tend not to clout my pier whilst imaging and it seems to stay quite still -
mind you I only built the Obsy last week and I've only had 2 hours to set it up last night and the night before.
The moon didn't do much more than allow me a chance to drift align.
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