hmm, i cant see your pic Allen,...
and......WARNING! WARNING! FUNGUS CAN WEAKEN BAMBOO!
I just broke the top tube of my bamboo mtb frame! i think what happened is it cracked on a jump, as i heard the shuddering sound of splitting as i landed in a big pothole,
rode it home fine, then the next day i jump on it off a curb and the bike litteraly split in two!!!!
the downtube got pulled right out of the lug once the top tube broke near the end, leaving the front end of the bike in my hands and the rear on the street behind me!
On examination of the tube i noticed thin black lines coursing through the wood, also visible on the surface if you know what you are looking for. now i know what to look for, as it is obvious the fungus had eaten the bamboo well before i flame cured it, and applied polyuethane varnish to the interior...
i am really really bummed about this, but am slowly getting over it. I have completely dis assembled my first two bikes and am trying new anti fungus treated bamboo sources .