Day 2:
Head tube balsa lug core after shaping. Goal is to make smooth transitions from the bamboo tubes to the steel head tube. Fiberglass will first be applied to these joints before the frame can be lifted from the jig, remounted vertically prior to carbon wrapping. Note the roughed bamboo end...with lots of exposed fibers to enhance bonding strength. There is a definite technique needed with the pull saw to achieve this...I practised on a spare section of bamboo. According to BBS website, you should aim to complete epoxy bonding within 48 hours of perfoming this roughing to reduce drying out of the fibers...which reduces bonding strength.