Name:  IMG_20170426_200503.jpg
	Date:  2017 Apr 26
	Size:  0.89MB
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    Doubling up the ground ring
    3_4" plywood (19mm) scrap glued & screwed together.
    The ring needs to be thick enough resist bending down.
    It must be at least as strong against bending "out" (trefoil-ish)

    Note: the inside edge relief of the SudiBall in the background 
    where the tube will pass thru