Inflatable leveling tool.
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Previously:
https://www.homemadetools.net/forum/...193#post130496
https://www.homemadetools.net/forum/...186#post161200
https://www.homemadetools.net/forum/...118#post160939
https://www.homemadetools.net/forum/...129#post157537
https://www.homemadetools.net/forum/...947#post152927
https://www.homemadetools.net/forum/...860#post152540