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1] Is the sonotube placed straight down, to the bottom of the hole - so that the base is flush with the bottom surface of the hole?

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NO it does not. There are a couple of ways to do this. a) Do it in two pours, The 2x2x2 base first with the rebar in location up into where the sonotube will be placed,after that has setup, then put you sonotube down to the concrete you just poured & pour the tube. b) make a plywood or a OSB top that will cover the 2x2x2 hole that has a hole for the sonotube. Mount the sonotube on that cover so the tube is flush with the bottom of the cover. Place the cover over the hole & stake in down. Brace the sonotube so it is vertical. Then pour it all at once though the top of the sonotube.

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Carl

Hawkeye Observatory
Observatory - "Hawkeye"
Scope - 18"f4.5 on a GEM
8" f4.9 Orion piggy backed
Drive - Sitech Technology
DSC - Sky Commander
Planetarium - MegaStar
Camera - ST2000XM
Desire - comes & goes
Talent - ZERO, NONE, NADA (But I can Wish)

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