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Scott,

I am an electrician by trade. Plastic conduit is easy to repair. If you are going to cut the concrete you have to do it on all 4 sides of the pier because any contact with the slab will transmit bad vibes. You may also want to check on vibration suppression pads or mounting hardware that are commonly used for industrial and machine shop equipment. Good Luck.

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Thanks Joe, that's good to know about conduit. How would you repair it, by the way? (I really am a big idiot about construction.) I'd assumed you'd have to cut it on all four sides to really work.

I'm actually looking at this vibration suppression pad:

Pier-tech Vibration Isolation Platform

I think that, coupled with a much more stable telescope mounting (I'm going with a Paramount ME) may do the trick. But in case it doesn't, I want to have some other options, including worst case ones. (And if there are easier ideas, I will try them first.)

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