Van's RV-8 Build. Ep 097. Wings 26. Main spar countersinking finale - That Hippie Pilot Watch in HD on YouTube! Share on Facebook! This episode begins with an embarrassing, but fortunate, admission of a mistake... Five hours completing the last of the main spar countersinks and squeezing a handful of rib flange-to-spar flange attachments that will be covered by the fuel tank skins.