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bonsaiTALK Master Chief
Join Date: Nov-2001
Location: Southern New Jersey, USA
Country: USA
Posts: 1,025
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I believe it is less than 5 inches. 
One note: make sure that when you make the grooves, that the inside is larger than the edges. In other words under cut. That way when the branch or trunk grows larger it cannot pop out of the groove.
Cross section: / (_) \
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Carl L. Rosner - near Atlantic City zone 6/7
arteacher3725@yahoo.com
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